根據(jù)句意及首字母或漢語提示完成句子。
1. You will fail in the Chinese exam u _____ you study hard.
2. Everyone can make mistakes. Don't l _____ at him.
3. Look! It says "No P _____ " on the sign. You'd better drive your car away.
4. The air in the morning is very f _____.
5. He d _____ himself as a clown at the costume party.
6. Tell the t _____, or I won't believe you.
7. We should try our best to protect e _____ animals.
8. Some of the rivers have become p _____.They are dirty now.
9. The boy looked w _____ because he couldn't find his keys.
10. Our teachers asked us to do our homework as c _____ as we can.
