请帮忙啊!{30}分英语题

请帮忙啊!{30}分英语题
1.the student doesn't work___he used to.
A.so hard as B.so harder thanC. as harder asD. as hard like
答案选A 为什么?为什么不选 C ?
2.--Could you have been more careful?
--Why,what wrong__I__?
A.did; doB.will;doC. have; doneD. had; done
答案选A,为什么?为什么不选 D 或 C ?
3.last Sunday___ had a picnic in BeiHai Park.
A.John , Mary and IB.John, I and Mary
C.John,Marry and I D.I, John and Mary
为什么不选A?
4.In this park,sparrows often fly down from trees to eat from visitor'hands.Thay are used to____in this way.
A.be fed B.feed C.having fedD. let
为什么不选 A ?鹦鹉不是被喂么?
5.Many thigs____impossible in the past are quite common today.
A.having been considered B. to be considered
C.considereing D. cosidered
为什么不选B?有B 这种形式么?
6.He is not my friend.He's______but a stranger.
A.anythingB.nothing C.anybody D. nobody
为什么不选B?
7.I hung the picture on the wall____can be seen well.
A.where B.where itC. thatD. so that
为什么选B ?这种句子怎么分析?
8.This is the very book_____I want to find.
A.thatB. whichC. itD.with which
这种句子怎么分析?此句缺少了什么成份?
9.出现那些词,或短语时,句子要到装?only if;in no way
请大家帮帮忙,尽量详细些,谢谢