用所给单词的适当形式完成句子。

1. The water in our city is _    __ (recycle) many times.

2. A new bridge is being      ___ (build) in the river.

3. These boys are       __ (pull) their boat out of the lake.

4. Many _         (roof) were blown away by the strong wind.

5. We can see a lot of _     _ (can) on the ground in the park.

6. The old school        _ (pull) down and a new one is being built.

7. My sister joined a university film       _ (social).

8. Some students          (dance) while others were singing.

9. You should stop          (worry) about it.

10. Our new school is the  ____.