Be careful, _______ you'll fall down.
A、onthecontraryC
暂无解析
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
Ifyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.
When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.