根据句意及首字母或汉语提示，填写句中所缺的单词。

1. We must be p________ if we ask others questions.

2. Kate r________ a letter from her grandparents three days ago.

3. She is an e________ teacher, so we all like her class.

4. you must be careful to c________ the road. It's dangerous.

5. The teacher looks very angry. Do you know what h________?

6. She was very ________(紧张) while she was having a test.

7. It's not right for you ________(抄) others' homework.

8. She had a very unusual ________(经历) on last Sunday.

9. She wants to be a ________(科学家) when she grows up.

10. If you have a ________(机会) to go to America, take it.