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Starting air valves are held firmly on their seats by_______.A.cam rollers on the camshaft
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School started on a_____cold day in February.（2010－69)A．severeB．bitterC．suchD．frozen
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Come on, _______ up your sleeves and start work.A) pushB) turnC) rollD) fold
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I was_____ my _____to school when I saw him.A. on, timeB. in, wayC. on, way
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When George was a little boy in primary school, he often______to school on foot.A．goesB．we
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Many students at the school _______ on a project
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Education is a lifelong experience that starts long __________ the start of school.
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