A baby might show fear of an unfamiliar adult, _______ he is likely to smile and reach out to another infant.
A、ifB
暂无解析
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Thestudentfoundthenovel_______.Itprovidedhimwithsomuchinformationaboutthesubject.
Itisusefultoscience_______theearthasanobjectinspace.
Theproblem________whenthestudentsrefusedtodotheirhomework.
________theconcerthadbegundidwerealizewhatasplendidshowitwasgoingtobe.
