4. 现在河流比以前干净多了。

The river is

3. 那家工厂过去常把废弃物倒人河中。

The factory  its the river.

2. 政府已将部分镇中心变成了新公园。

The government a new park.

四、完成句子。(20分)

1. 这个小镇在几年中已经发生了很大变化。

The small town

10. It’s necessary for us (realize) the importance of environment protection.

9. About 30,000 people (live) in this small town in the past.

8. We lived together until 1960 when I (get) married.

7. My bike isn’t here at the moment. Who (take) it away?

6. The little boy is crying sadly because he (not pass) the exam.

5. Mike and Mark (do) their homework since half an hour ago.