单项选择题

______vigilance is necessary in order to avoid accidents.

[A] Constant
[B] Continual
[C] Continuous
[D] Incessant

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单项选择题

Education should be made ______and educational standards should be raised.

[A] general
[B] universal
[C] average
[D] common

单项选择题

After going straight for a bit, he will ______to stealing.

[A] invert
[B] convert
[C] revert
[D] divert

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