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Battery-operated slippers are used ______ seeing in the dark.
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A
to
B
as
C
by
D
for
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An terrible earthquake happened          the Indian ocean          a spring afternoon.
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A
on; in
B
in; on
C
on; on
D
in; in
The 31st Olympic Games will take place in Brazil ______ 2016.
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A
at
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on
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Jack’s sister has been a tour guide _______two years ago.
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for
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since
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—What’s your speech        , Dr．Smith ?—Tomorrow you will get it．
#50508
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by
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of
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on
We should protect the animals ______danger.
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A
on
B
in
C
of
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at