When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.
A、tookB
暂无解析
Theboyranoutoftheclassroomwithouttheteacher's_______.
________fromtheoccasionallatenightparty,ourneighborsareveryquiet.
Thefarmerhadtowearheavybootsinthewinterbecausethefieldsweretoowetand________.
Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.
