语法词汇练习 语法大全 语法详解 英语听力 
Some volunteers(志愿者) from Beijing arrived in Shanghai       April 29 to work for the World Expo.
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on
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I’m looking after Tom today. He’s been in my house______8:00 this morning.
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at
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for
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since
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Nobody can live________ fresh air and clean water.
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with
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The 30th London Olympic Games will begin _______ 27th July 2012.
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in
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Some of them are _________ Chinese style.
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in
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at
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---________do you spend _English learning every day? ---For about an hour.
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How long, in
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How many times, on
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How often, on
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How long, on