16．Dear Michael,
I am glad to learn that you have been chosen to study in China. Your dream has come true!
I can well remember that you (1)       China for the first time when you were nine. Ever since you returned, you have been interested in Chinese culture and have put a lot of (2)       into learning Chinese. When you first started to learn Chinese, I (3)       it was nothing but a passing fad (一时的狂热). However, you didn't (4)       halfway, but kept on learning and did a good job in the HSK (汉语水平考试). Now you finally got what you had (5)       for a long time. You got the chance to (6)       life in China for one year. You should have it, my son, for chances only come to those who are (7)      .
When you study there, you will have to face (8)       in everyday life that you have never experienced before, but after a year abroad, you will return with a new (9)       at life and at yourself.
Your mum and I are both (10)       you. Keep it up, my son!
Love,
Dad

17． Are you shy? If you are, you are not alone. In fact, nearly 50% of people are shy, and almost 80% feel shy at some point in their lives. Why are people (1)       ?
It is found that family size might (2)       people to be shy. Children with no brothers and sisters may be shy. Growing up (3)       , they often play by themselves. They are not able to develop the same social skills as children from big (4)      .
Another cause of shyness could be (5)       . As more and more people use the Internet, they (6)       less time outside, talking to people. As a result, they lose practice at conversation. (7)       to new people face to face can make them feel nervous.
For shy people, it can be (8)       to make friends, speak in class, and even get a good job. But scientists say you can (9)       your shyness. They suggest trying (10)       things and practicing conversation.
Anyway, don't be afraid of shyness－you are valued for what you are!

18．A: Lucy, how long have you been in China?
B: (1)      
A: Wow! That's a long time.
B: Yes, and I'm going to stay longer to see how the Mid-Autumn Festival is celebrated here.
A: (2)      
B: Can I? That's very kind of you!
A: (3)       We'll celebrate it in the countryside.
B: (4)      
A: Yes, I'm sure you'll learn a lot about Chinese traditions there.
B: Sounds great! (5)      
A: Looking forward to your coming.

19． It is expected that Pacific Island countries will become popular with Chinese tourists in 2019. Which one should you choose for your summer holiday?

20． Have you tried to run or walk for exercise and then given up? If you answered yes, you should try a new kind of exercise: aquatic (水中的) exercise. Aquatic exercise is like exercise on land, but you do it in a swimming pool. More and more people are trying aquatic exercise.
Aquatic exercise feels easier than exercising on land. Why? You weigh about 90% less in the pool. It is better for your knees than running or walking. Water is about 1, 000 times thicker and heavier than air. To move through the water, your body has to work four times as hard. As a result, you can burn more calories (卡路里).
In fact, most people say they feel more relaxed in the water. They stop thinking about the things that make them worried. They feel in control of their bodies. The cool, quiet environment makes them feel good.
But what if you are afraid of the water? No problem! There is nothing to worry about. Aquatic exercise is safe and easy to learn. It doesn't require any special skills. You don't even need to know how to swim. Aquatic exercise is for everyone.

21． Like many high school graduates, Maggie Doyne didn't go straight to college. She decided to travel and arrived in western Nepal in 2006. A war had just ended there and left many children living on the streets. They were often forced to work at hard physical jobs for little money.
One day, while walking down a country road, Doyne saw a little girl breaking up rocks. She soon learned that 7-year-old Hima sold the rocks to support her family. With deep sadness, she decided to pay Hima's tuition(学费) for school. Encouraged by the changes in the child, Doyne thought, "If we can help one child, why not 10?"
Doyne felt that the street children's greatest need was a home. She found a piece of land for sale and bought it with 5, 000 she saved from years of babysitting (当临时保姆). In 2008 the Kopila Valley Children's Home was set up. With the help from the community, another goal was reached in 2010 — the Kopila Valley School. Over 350 children now attend the school and over 50 live in the home.
Today, Doyne lives in the home and is "mum" to the kids.

22． The world uses about a thousand million (百万) tons of water a day. Water is a human right and everyone should have their share. Yet more than 700 million people around the world have trouble getting clean, safe water.
Treating wastewater is a good way to provide fresh water for us. And it also helps the environment by keeping waste out of rivers and oceans. 80% of wastewater around the world is not treated at all, and it is running into oceans.
But now we have got the technology to treat and reuse the wastewater.
While 75% of our planet is covered with water, only about 2% is fresh water that comes from rivers, lakes, ice and snow. The rest, 98% of the water, is in seas and oceans. It is too salty to drink. Then desalination businesses come in. More than 19. 000 factories have been built around the world, mostly in coastal countries. They process (加工) more than 92 million tons of water every day. But the technology they use requires a lot of energy.
Scientists are working to create a less costly technology. They want to produce 20 times more clean water and make sure everyone has enough. But for now, the world still faces each day with not having enough water for everyone.

23． Remember when you were a little child trying to learn to walk?
First, you had to learn how to balance (平衡) yourself and stand. You fell down, and then got back up. You laughed sometimes and cried at other times. After much practice, you finally learned how to balance yourself. You got much pleasure from this new feeling of power — you'd stand everywhere you could. It was a happy time — you did it!
Now the next step — walking. You'd seen others do it. It didn't look that hard — just move your legs while you were standing. Wrong — more difficult than you ever imagined. But after you tried again and again and again, you understood how to walk.
If people found you walking, they cheered, "Oh, look at what the kid is doing" This encouraged you! But look back on those days when you were the little child — how many times did you try when no one was watching, or when no one was cheering? You couldn't wait for someone to encourage you to take the next steps. You learned how to encourage yourself.
So, keep trying and encouraging yourself as you learned to walk if you want to succeed in doing something.

1. What is the first step in learning to walk? (不超过15个词)
                                                    
2. When did you understand how to walk? (不超过15个词)
                                                    
3. What should you do if you want to succeed in doing something? (不超过15个词)