Fill and complete. 填表格，再用它们补全句子。
1．There are too many factories(工厂) here. They make the
_________ dirty.
2．Do you go to school by
_________ or by bike?
3．We should
_________ for animals. They are our friends.
4．Let's do something to
_________ our city beautiful.
5．We live on the
_________. It is our home.
6．I drink a lot of
_________ every day.
7．Please hurry up. We have no time to
_________.
8．We should
_________ more trees and flowers.
9．I
_________ my room twice a week.
10．My favorite
_________ is dog. I have a dog named Karl.
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