单项选择题

Don't ______. I can help you with the typing.

A．matter
B．worry
C．care
D．concern
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单项选择题
When the old lady is alone in the house, her dog makes her feel ______ and relaxed.
A．safe
B．healthy
C．lonely
D．angry
单项选择题
The salesman had to ______ the conversation in order to wait on a customer.
A．break off
B．break away
C．break in
D．break out
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