-----How long do you think it will be _____man can finally solve the problem of cancer?------Well．it depends．

________ she couldn't understand was ________ fewer and fewer students showed interest in her lessons.

______ seemed surprising to us was ______   he came out first in the speaking competition.

 —How can I wake up so early?—Set the alarm for 5 o'clock, ______ you'll make it.

—You look tired, Jack． What's wrong with you?—Oh, 1 worked quite late last night． Nothing wrong with me,       ．