1 the man is always laughed at
2 he must be prevented from going there
3 he was married last week
4 steel feels very cold【这个我想不出被动】
5 the project is proved to be very useful
6 the work starts at 7；00【这个用被动也怪怪的】
7 the patient is treated once a week
8 he was seen to enter the building
9 this kind of vine tastes good and is sold well