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6. The bad food shouldn't be       (eat).

5. 丁he water should        (not put) here.

4. Thanks to the Internet,different kinds of information can      (learn) in a short time.

3. Where can the lost boy      (find)?

2. Must the work      (finish) by 6：30 this afternoon?

1. Many more trees should      (plant) this year.

20. 電話是什么時候被發(fā)明的?

When      the telephone                ？

19. "許多種污染方式，例如噪音就是一種污染。

There arc many kinds of pollution,      ，noise is a kind of pllutioa

18. 我".歡這雙帶著特殊鞋跟的鞋子。

I like the shoes                 

17.他從末向我提起過他父母。

He never      his parents      me.