单项选择题

Its hard to (alter) ones habits.

A．change
B．develop
C．shorten
D．enlarge
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单项选择题
Grandfather would (stay up) till small hours reading.
A．sit up
B．sit in
C．sit on
D．sit through
单项选择题
She (undertakes) to verify the true source of the rumor.
A．tries
B．decides
C．promises
D．refuses.
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