根据句意及所给汉语提示写出单词的正确形式。
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 _____(无论何时) 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.