4. Mark t his fingers on the tabletop impatiently while waiting for the result.

3. I'm afraid the work is beyond his c .It's too difficult for him.

2. Switch off the electric c before touching that machine.

根据下面各句句意以及所给单词的首字母或汉语提示词，写出该单词的正确形式(每空一词) 。

1. Put a book under the table to keep it (稳固的) .

8. I found a man (stand) at the door when I came home

yesterday.

7. All afternoon he worked with the door (lock) .

6. Have you ever heard a song (sing) in Japanese?

5. There were 220 students (study) in the art school.

4. The play (put) on by the teachers was a big success.

3. What's the language (speak) in that country?