单项选择题

Miss World is trying her hard to save the poor children from ______.

A．happy
B．happiness
C．unhappy
D．unhappiness
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单项选择题
Professor Smith as well as his children ______ on running every morning.
A．keep
B．keeps
C．keeping
D．kept
单项选择题
They all enjoyed ______ to play the guitar.
A．learning
B．learn
C．to learn
D．learned
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