When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.
B
暂无解析
Iboughtthiseighteenthcenturywritingdeskataquite________price.
________they'vegottoknoweachotheralittlebetter,theygetalongjustfine.
________tothepapersisrestrictedtoDefenseDepartmentpersonnelonly.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.