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1. We are all _____(自豪) of our motherland. It's great.
2. The boy shows great interest in _____(自然) science.
3. Welcome to our city _____(無論何時) you come!
4. No country can afford to neglect the _____ (教育) of its young people.
5. I think that _____ (二十一) century will bring us more hope.
6. He made a big d_____. He'll travel around the world all by himself.
7. Many people have known the i_____ of protecting the environment now.
8. My mother is very s_____  with me in my study. She never allows me to miss
lessons.
9. A_____ he had only entered the contest for fun, he won the first prize.
10. —What's the matter with you?
      —I have a toothache.
      —I think you should go to see the d_____ fight away.

A. I have no time
B. I'd rather not
C. You can leave
D. I'd be happy to