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It matters little _______ a man dies, but ______ matters much is ________ he lives.

       A. how; what; how        B. how; it; how             C. why; it; why             D. that; what; that

．_____ we can pass the coming examination will mainly depend on _____ we learn and _____ learn it.

         A. Whether; what; how   B. That; whether; why     C. If; how; that         D. Why; that; how

 ______ interested us most was ______ he saw last night.

___ is known to us all is ____ the sun is bigger than the earth.
A It; that    B What ; that   C What ; how    D That; that

In his book,he explains both ______ it means to be a scientist and ______ science works.

A.how; how                                                                       B.what; that

C.what; how                                                                     D.how; that