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Some people don’t known the value of their health     they lost it.
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after
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when
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until
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as
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The students are studying at home        computers.
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in
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at
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on
D
of
—Excuse me, Maria. Can I use your bike?—Sure. Here you are. But you must return it _____ time.
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in
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at
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on
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to
She gave the students a lesson ____ Mr. Wang.
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instead
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instead of
C
instead on
D
instead in
---I can’t find the key _____ the bike, can you help me?
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for
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to
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with
D
on
The bus hasn’t come yet. Many people are waiting ______ the bus stop. 
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at
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for
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on
D
in