Americans are nervous ____________ the prospect of a nuclear-armed Iran, but also worry
__________ the ability of the United States and the United Nations to deal with the situation.
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The meeting will begin at ten.So you have to be there _________ 9:50.?
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You can either fly to Abu Simbel or you can take a boat from ____ the lake.
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It may rain --- you¡¯d better take an umbrella _________.
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Many peasants in the north go to the south _____ much money.
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