请各位通晓英语语法的大哥哥大姐姐们帮帮忙

本人在学习英语中遇到几个问题希望大家帮忙解决一下，在下无限感激。
1.-Can you send one of the boys to give me a hand?
-Certainly._____ do you want.
A.Which B.Who C.Whom D.What (A)
2.All matter, _____ it is solid, liquid, or gas, is made up of atoms.
A.if B.no matter C.even though D.whether (D)
3.The fuel must have been made up, _____the machine didn't work.
A.as B.since C.for D.because (C)
4.Last term our physics teacher gave us so difficult an examination problem _____ none of us worked out.
A.that B.as C.so that D.which (B)
5.A student was caught _____ during the exam, and he admitted _____ other's test papers.
A.to cheat;copying B.to cheat; to copy
C.cheating;having copied D.cheating; to have copied (C)
6.Is this book _____ she was looking for.
A.which B.where C.when D.the one (A)
以上为题目与答案，答案为括弧内的选项。望大家畅所欲言，告诉在下您的分析及不选其他选项的理由。 无限感激。

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