单项选择题

Scientists everywhere are trying to（）a cure for AIDS.

A．expect
B．invent
C．discover
D．make

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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
单项选择题
Helen was much kinder to her youngest child than she was to the others,（）of course, made the others jealous.

A．who
B．what
C．that
D．which
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