1. 结合语境，根据汉语或首字母提示用单词的适当形式填空。

1. （1） The h of the door is off.
3. （2） Don't come to the c before you make a careful investigation.
5. （3） We d Lincoln High School in the baseball game yesterday.
   
7. （4） Some chemical are easily a into the bloodstream, while others are not.
9. （5） The opposition leader c the prime minister to call an election.
11. （6） How many people (参加) your wedding?
13. （7） They (怀疑) me of having a hand in the affair.
15. （8） She (责怪) him for the failure of their marriage.
17. （9） The air is (污染) so badly in some regions that people could hardly breathe.
19. （10） Good planning is one of the (特征) of a successful business.