【B15】A．byB．forC．uponD．from

【C4】______A．calling offB．calling forC．calling uponD．calling up

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【C20】A．onB．forC．uponD．at

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The second engineer seemed to know what the sign ______.A.stand byB.stand forC.stood byD.s

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【C8】A．byB．forC．withD．without

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【C3】A．byB．withinC．uponD．for

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Between 2001—201 1, the number of overseas visitors expanded ______ 55%.A．byB．forC．toD．in

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Early retirement is a means of reducing the work－force______avoiding redundancies.A．byB．wh

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