题目内容：

请根据所给的首字母和中文提示完成句子，每空一词。

1.It never o_____ to me that you could succeed in persuading him to change his mind.

2.In many ways, time is the most p________ thing that we have. Yet most of us treat it as though it has hardly any value at all.

3.At the moment when he gets the first prize on the stage, I can’t help a_______ for his excellent performance.

4.Take good care of trees and bushes. We should live in h________ with nature.

5.Taking photos is strictly f_______ in the museum.

6.The north of China, ________(不像)the south, is windy in spring.

7.I’d like everyone to ________(聚集) round so I can demonstrate how the system works.

8.If we persist in practicing, ________(逐渐地)we’ll learn how to express ourselves in English.

9.The earthquake ________(见证)the kindness of strangers in an emergency.

10.With each attempt, he looked so confident and natural. There aren’t any signs of fear or being ________.(泄气)

11.If you are free on Friday, we ________ (推荐) visiting the national museum.

12.We are having pizza ________ (递送) for dinner tonight.

13.He commented that this novel was a ________(杰作)of American literature.