Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
A、ifItisusefultoscience_______theearthasanobjectinspace.
Theenginehasbrokenandtheboatis______onthewater.
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
I'm______tograduateinthenexthalfoftheyear.
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
