單項選擇題If the man()succeed,he must work as hard as he can.

A.will
B.is to
C.is going to
D.should


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1.單項選擇題If he was fitter, he()live longer.

A.–(不填)
B.will
C.would
D.can

2.單項選擇題If there were life on Mars, such life forms()unable to survive on earth

A.is
B.are
C.would be
D.will be

3.單項選擇題He is over fifty, but he looks as though he()only in his thirties.

A.were
B.is
C.will be
D.has been

5.單項選擇題If you don't promise to help build more houses, ordinary people()

A.will not be nefit
B.would not be nefit
C.should not be nefit
D.could not be nefit