题目内容：

 

1.Laughter is beneficial to health and perhaps this e________ the long lives of some famous comedians such as Bob Hope and George Burns.

2.You always hear about planes being delayed because of t__________ problems.

3.China has always been trying to s__________ its economic ties with European countries.

4.The twins are so alike that I can hardly tell them a________.

5.At the meeting, he expressed his a__________ for the kindness we had done for his team.

6.The s________ of innocent people caused by the war cannot be compensated for by money.

7.When you laugh, the muscles p_________ in the laugh become active, which is like a deep-breathing exercise.

8.Although it happened many years ago, it still remains in the d_________ of my soul.

9.He is such a c_______ boys, always asking questions about the world around him.

10.More than half the staff are t________--they will quit when the harvest season ends.