A：　 　l6　 　　　l7　 　　I do for you?

B：I picked　 　l8　 　　lots of waste paper．I'd like to sell it, but I　 　l9　 　　know　 　20　 　　to go．

A：Don't　 　2l　 　．I live near here．I Can lead the　 　22　 　　for you．

B：Thank you．Is it　 　23　 　?

A：No，it's only about ten minutes'　 　24　 　．Let me help you　 　25　 　　the bag．

B：It's very nice of you．

15．The young man felt really nervous before the _________．(面试)

14．The boy _________(撕破)the paper into pieces yesterday．

13．His aunt died _________．(突然地)

12．The old man is a famous _________(科学家)．

11．The sun _________(升起)in the east every day．

10．Who can r_________ my watch? It doesn't work very well．

9．It's a w_________ to throw away good food．

8．We should try to make our e_________ clean．

7．The population of the world is i_________ quickly．