It took us several hours to make the old man _____ of the safety of travelling by air.[ ]

A. believed  

B. convinced

C. informed  

D. persuaded

小题1:Doctors have discovered that _______________________(经常大笑的人长寿)。

小题2:To some, happiness is being surrounded by family and friends. To others, _____________________________(幸福意味着在某个方面取得成功)， such as meeting a goal.

小题3:When I was a child, I could spend all day outside, ___________________(和自己的朋友在太阳底下玩。)

小题4:_________________(了解文化差异)is a good way to understand more about each other.

小题5:The picture of the young girl in the magazine _______________(让我想起了我的表妹)。