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If (如果) you have problems (问题)，you can ask Tom _____ help.
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to
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 They have eggs and apples _______ breakfast.
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for
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at
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in
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with
——You look excited. What happened?       ——I saw a rabbit and ran _________ the field after it.
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through
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cross
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across
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crossing
She had to sell the house even though it was       her own wish.
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above
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on
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against
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for
No smoking, please. It’s ____ the rules.
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against
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for
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on
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at
--Where’s Shanghai?--It’s __China.
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of
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in
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at
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to