单项选择题

John's score on the test is the highest in the class; he ______ last night.

[A] must study
[B] should have studied
[C] must have studied
[D] is sure to study

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单项选择题

You cannot be ______ careful when you drive a car.

[A] very
[B] so
[C] too
[D] enough

单项选择题

It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.

[A] adjustment
[B] supply
[C] assurance
[D] provision

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