单项选择题

It is assumed that students at an intermediate level will have a good（）of the basic structures and vocabulary of English.

A.command
B.commanding
C.to command
D.commanded

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A.this opportunity
B.a chance
C.this time
D.aperiod

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单项选择题Please leave the key under the door（）you go out.

A.in case
B.in the case
C.in case of
D.in the case of

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单项选择题We have kept（）our friendship by writing to each other, so we are true friends.

A.back
B.up
C.off
D.down

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