资料简介：    用括号内所给动词的适当形式真空
1. I´m going to listen to the radio. Please ____ (not talk) any more.
2. The students ____ (do) their homework from four to five this afternoon.
3. The students ____ (be) busy now. They ____ (have) an English exam next Monday.
4. Mary must ____ (look) after her little sister because she is too young.
5. ____ (he) you waiting for a bus now?
6. This coat is very cheap. I ____ (take) it now.
7. I´ll tell him about it when he ____ (come) back.
8. Could you tell me how .I ____(can get) to No 3 Middle school.
9. He ____ said that the new teacher ____ (give) the students an English lesson now.
10. I ____ (milk) a cow three times.
11. Edison´s mother ____ (teach) him herself.
12. He ____ (watch) TV once a week.
13. Don´t speak loudly . The baby ____ (sleep).
14. I won´t go out until .I ____ (finish) my homework.
15. Could you tell me when the train ____ (arrive).
16. I often hear the sound of children ____ (read) English in the room.
17.He asked me ____ (help) him with his English this evening.
18. Their work is ____ (clean) the streets.
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