当今时代，知识更新不断加快，社会分工日益细化，新技术新模式新业态层出不穷。这既为青年施展才华、竞展风采提供了广阔舞台，也对青年能力素质提岀了新的更高要求。
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If the child hadn't been so tired, he _______ asleep so quickly.
A. will not have fallen
B. will not fall
C. would not have fallen
D. had not fallen
_______ more carefully in the class yesterday, she would not make so many mistakes now.
A. If she listened
B. If she listens
C. If she has listened
D. Had she listened
If he had taken my advice, he _______ a scientist now.
A. will be
B. is
C. has been
D. would be
______he try again, he might be successful.
A. Could
B. Might
C. Should
D. Must
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