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3. 四年前这是一个美丽的湖泊，但是现在一切都变了。

This       a beautiful lake four years ago, but now         changed.

3. was;everything has

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(   ) 3. ―Do you want to swim in this river?
―_______ The water is so dirty.

A.  Of course not.

B.   That's all right.

C.   I'd love to.

D. I'm afraid so.

3. Soil pollution is such a serious problem that we should do something       (reduce) it.

2. Schools should teach students about road safety to a      traffic accidents.

1.In summer，we can always see s       bees and butterflies flying around the flowers.

8. 我们打算这个周末去野餐。

We plan to      this weekend.

 2. It's going to rain. You'd better      (take) an umbrella.

1. As we know,air pollution is harmful to people's health.(改为同义句）

①  As we know， air pollution            people's health.

②  As we know， air pollution              people's health.

1. It costs 2 ， 000yuan to join this chess c      

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