单项选择题

Without a (an) ______ passport a tourist is forbidden to enter a country.

A．operative
B．effective
C．valid
D．efficient
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单项选择题
It was the driver’s ______ that caused him to step on the gas instead of the brake after his car went over the curb.
A．fraud
B．alarm
C．terror
D．panic
单项选择题
Danny left this ______ message on my answering machine: I must see you. Meet me at twelve o' clock. Did he mean noon or midnight
A．ambiguous
B．responsible
C．implicit
D．thoughtful
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