单项选择题

We are so busy that we had to （）our vacation till next month.

A.put away
B.put down
C.put off
D.put out

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单项选择题

We firmly ______ in the future victory of the revolution.

A.specialize
B.participate
C.believe
D.delight

单项选择题

One of Bettie’s brothers was killed in action，another （）.

A.takes prisoner
B.took prisoner
C.taken prisoner
D.taking prisoner