（急）英语高手请帮忙解释一下这些单选（初三被动语态）
1
chineseby more and more people in the word.
2
you may go fishing if you work 为什么不是have done
3
the doctor looked over peter carefully after he to the hospital.
4
-where are the desks?
-they to the second floor by two boys.
5
-did you go to jim's birthday party?
-no,i