单项选择题

It is always useful to have savings to ______.

A．come out in
B．live up to
C．make a fuss of
D．fall back on
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单项选择题
Tom and Ben have ______ again and stop talking to each other.
A．fallen in
B．fallen out
C．fallen through
D．fallen up
单项选择题
If the right kind of extracurricular activities is organized, those children who have a (an) ______ of energy will have a chance to develop their talents much more quickly.
A．consumption
B．exploration
C．exhaustion
D．excess
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