单项选择题

Study in moderation is agreeable as well as (health) ______ to human beings.
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单项选择题
I felt so embarrassed that I couldn't do anything but ______ there when I first met my present boss.
A．to sit
B．sitting
C．sat
D．sit
单项选择题
In developing countries people are ______ into big cities in great numbers.
A．breaking
B．filling
C．pouring
D．hurrying
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