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_____ Yang Liwei was trained for the space travel is what I want to know .

   A. How          B. That            C. What             D. Who

We must face the fact __________ our time is limited and we must cherish every minute.

  A. which          B. on which        C. that             D. why

Good communication is very important       your job is.

       A．whatever  B．however   C．whichever D．whosever

He was just about to jump into the river       luckily his guide saw him and stopped him.

       A．while       B．as      C．when D．since

There is no doubt      you will pass the exam this time. You have worked so hard in the past      months.

       A．whether    B．that   C．if      D．what

Choosing the right dictionary depends on ______ you want to use it for.

A. what                 B. why                         C. how                          D. whether

The difficulty we now meet with is ___________ we can persuade him to tell the truth.

    A. whether            B. that                          C. what                     D. why

______ the ancient Egyptians built the pyramids puzzled people for centuries.

　 A. Whether                B. What              C. How                    D. Where

We agreed to accept ___________ they thought was the best engineer.

      A. whatever             B. whomever             C. whichever              D. whoever

______ I’m well again, I can go on with my work.

　 A. Even if            B. As though          C. Ever after            D. Now that