8、We had a very unusual ______ (经历)on Sunday.

7、I couldn’t find my pen ______ (在任何地方).

6、I like all the subjects ______  (除)math．I think it’s very diffcult.

5、My mother was watching TV w ______ my father was reading newspapers.

4、Parents and teachers should give students f____________.

3、There was an a ______ on the road(马路)yesterday．

2、In big cities，air p ______ is quite serious．(严重)

1、R ______ can do many things for human beings(人类)