单项选择题

I've been reading a mystery story. Many (mystery) ______ events took place in it.
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单项选择题
Scientists everywhere are trying to ______ a cure for AIDS.
A．expect
B．invent
C．discover
D．make
单项选择题
After a meal in a restaurant, you should ask the waiter for the ______.
A．bill
B．note
C．receipt
D．menu
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