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Mike often exercises      half an hour in the morning.
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at
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of
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with
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for
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Only four days remained ____ the exam.    
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at
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after
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before
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since
We can get fresh water from rain, from rivers, or from ________ the ground.
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across
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under
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over
D
off
Every morning, he listens to English news_________ the radio.
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from
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on
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in
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to
---________do you spend _English learning every day? ---For about an hour.
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How long, in
B
How many times, on
C
How often, on
D
How long, on
China is famous ______its food in the world.
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for
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at
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with
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in