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His father is __________ engineer and he works __________ research.
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an, on
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an, with
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the , on
D
a, with
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 The little boy is very fat          eating too much food.
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so
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so of
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because
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because of
—Do you know that our school has been named Green Olympic Demonstration School?—Yes. We are all excited ___________ that.
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at
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for
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about
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 What are you doing       vacation?
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in
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on
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The matter is just a secret     you      me. Please don’t tell others about it.
#51121
A
from; to
B
between; and
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from; and
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between; to
We can learn a lot            Chinese history.
#48141
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about
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for
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of
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from