1 . In nature, many kinds of materials can_________(与…发生反应) each other under certain conditions.

2 . The father was so tired that he quickly ________ (入睡) after lying in the sofa.

3 . I sent an application to the company but have received no reply from it ________(到目前为止).

4 . I _________(过去常常) play the piano when I was free, but now I have no time to do that.

5 . The young girl __________（沉迷于，对…上瘾）reading, from stories to political books gradually.

6 . I can’t accept an opinion unless it ________ _________ _________ (以……为基础) facts. (根据汉语提示完成句子)

7 . We must _________ _________ ________(意识到，知道) the danger we are facing now. (根据汉语提示完成句子)

8 . Brian is gifted in writing music; he _________ _________ _________(有可能) be a Beethoven. （根据汉语提示完成句子）

9 . The little girl felt frightened _________ _________ ________ _________(一看见) the dinosaur toys. （根据汉语提示完成句子）

10 . She ________ _________(遇见) an old friend of hers yesterday while she was shopping at the department store. （根据汉语提示完成句子）