单项选择题

You cannot be ______ careful when you drive a car.

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

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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

单项选择题

The new manager had many difficulties to overcome but he took them all in his ______.

[A] step
[B] position
[C] stride
[D] duty

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