单项选择题

As the shortage of certain metals approaches, others must be found to take their ______

A．share
B．role
C．place
D．shape
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单项选择题
I don't know why he ______ in the middle of a sentence.
A．broke away
B．broke out
C．broke through
D．broke off
单项选择题
What a lovely party! It's worth ______ all my life.
A．remembering
B．to remember
C．to be remembered
D．being remembered
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