87．You__(本來不必進(jìn)行)all those calculations．We have a computer to do that sort of thing．
88．__(中國居于方便面需求榜首)，followed by Indonesia，Japan and the US．
89．Some，green．h0．u，se gases occur naturally in the atmosphere，while others____ __ (由人類的活動造成)．
90．Maintaining proper weight is__(可以采取的的步驟之一)to prevent many health conditions and diseases．
91．Hardly had he finished his work____(電話就響了)．
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88．__(中國居于方便面需求榜首)，followed by Indonesia，Japan and the US．
89．Some，green．h0．u，se gases occur naturally in the atmosphere，while others____ __ (由人類的活動造成)．
90．Maintaining proper weight is__(可以采取的的步驟之一)to prevent many health conditions and diseases．
91．Hardly had he finished his work____(電話就響了)．
