请教些英语语法的题目

1._________,I have never seen anyone who's as capable as John.
A. As long as I have traveled B.Now that I have traveled so much C.Much as I have traveled D.As I have traveled so much
应该选哪一个?为什么?
2.I believe __________you've done you best and _____things will improve.
A.that;/ B./;that C.that;which D.if;that
为什么选B不选A?
3.While ______ the window, my finger was cut unexpectedly.
是填cleaning还是I was cleaning?这两个有什么不同啊?
4.-Will Chinese food ___you?
-I like all kinds of food. Either will____.
A.fit;be B.suit;do C.fit'do D.suit;be
为什么选B不选C?
5.A old woman always found ___ at the doorway.
为什么这里是填seated而不是sitting?sit和seat有什么区别?
6.We must make mor effort to solve the problem as soon as possible. It may lead to more serious ones if _____unsolved.
A.making B.remained C.keeping D.left
为什么选D不选B?
7.After________research, Snow decided that the water was the reason for the Cholera.
A.repeating B.repea

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