16. 工人们建成这所医院花费了多长时间？

　　 How long　　　 it　　　 the workers　　　 build the hospital.

25．[同安一中]

20. Don`t throw about rubbish. It is our duty ________ _________our environment.

　(别乱扔垃圾。我们有责任保护好环境)

19. Chatting(聊天)on the Internet is ___________　 ___________ wasting time, but also bad for our eyes.

　(网上聊天不但浪费时间，而且损害眼睛)

18. We will ____________　 ____________ hard until we succeed.

　(我们不懈地努力工作直到成功)

17. Xiamen is __________　 ___________ its beautiful sceneries.

　(厦门以美丽的景色而闻名)

16. To _________　 __________ is very important for us.

　(对我们来讲，保持身体健康是很重要的)

24．[杏林]

5. 我母亲正忙于做饭。

　 My mother is ________ __________.

4. 所有的红毛衣都卖完了.

　 All the red sweaters have been ________ _________.