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
Maria has blisters in her boots. She ______ walking such a long distance.
A. was used not to
B. used to
C. is not used to
D. did not used to
单项选择题
As electric lines were destroyed by the storm, they were forced to ______ light for several days.
A. go over
B. go in for
C. go without
D. go out
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