When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.
B
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Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
It'smore________tobuyaseasonticketifyoutraveleveryday.
ShegotajobasanassistantstagemanagerattheCambridgeArtsFestivalTheatre,thinkingthatitmight________toacareerasaplaywright(剧作家).
________,Johnhasbeentoseveralforeigncountries.
Ifyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.