15．They left the school together in ________(silent)yesterday afternoon．

14．Students need to do some _______(organize)group activities to communicate with each other．

13．There will be more air ________(pollute)if more and more people drive cars．

12．They have the same ________(predict)about the future．

11．There are a lot of computer ________(company)in Beijing．

10．Lucy ________(写)a letter to her sister after she got to the hotel．

(C)请你用所给单词的适当形式填空。

9．We want to use ________(更少)money to finish that work．

8．We had a very unusual ________(经历)last week．

7．Lucy made her ________(决定)to live with her mother．

6．These women are waiting for their ________(丈夫)to come back from the war(战争)．