英语语法请教,they are waiting for a bus

they are --- a bus now A waiting for B waiting they ,for ,bus ,the,waiting,are,a 连词成句 bus they waiting are a for （.） 连词 Are you waiting for a bus?回答 They are waiting for a bus to come (同义句转换) Look,they are waiting for a bus at the ____ ____ 单项选择They are waiting （ ）a bus （）the bus stop.A:for;in B:on;a （they are） waiting for the bus.画线部分提问 they are waiting for a bus ___ the bus stop.a.in b.to c.on d They are waiting for the bus?划线部分为：waiting kor the 对划线部分提问 单项填空.（ ） 1、Are they a bus?A、wait B、waiting C、wait for D、wait The students are waiting for the bus now用a