问题描述：
Don't forget the dentist's ____（约定）
My father went to Germany on ___(生意）last week.
Do you know how to o____ on the machine?
He was wearing a new cap,but i didn't even n___ it.
My father went to Germany on ___(生意）last week.
Do you know how to o____ on the machine?
He was wearing a new cap,but i didn't even n___ it.
问题解答：
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