单项选择题

It is imperative that he ______ home immediately.

A．should return
B．ought to return
C．must return
D．would return
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单项选择题
The machine has an enormous advantage ______ it is equipped with an automatic control system.
A．since that
B．in that
C．at that
D．so that
单项选择题
We got to work and succeeded, after a good deal of ______, in making our butter.
A．trial and error
B．morning and night
C．bitterness and hard
D．failure and success
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