1.However much_____,it will be worth it.

1.However much___A__,it will be worth it.
A.does the watch cost B.costs the watch
C.the watch will cost D.the watch costs
2.—Those shirts are very expensive.
—Do you know__C___.
A.how much cost them B.what do they cost
C.they cost how much D.what they cost
3.—Whenever I have to write a paper,I don't know where to begin.
—I have the same problem,but__C___the paper seems to write itself.
A.starting B.having started once C.once I started D.after starting
4.It was___B__men began to study the natural phenomena.
A.the earlist time B.the earlist time that
C.from the earlist time D.from the earlist time that
5.___C__with the size of the whole earth,the highest mountains do not seem high at all.
A.When compared B.Comparing
C.If we compared D.By comparison
6.—What about Dicken'snovels?
—Who__D__has read his great novels can forget their fascination
A.who B.that C.which D.whoever
7.There are very few rules of grammar____C_.
A.that are not with exceptions B.not having exception to them
C.that do not have exceptions D.not with exceptiong to them