They ____at school用am,are,is填空

They ____at school用am,are,is填空 用is.am.are填空 where ( ) they? 用am,is,are 填空 用am,is are填空 用am is are 填空 用am.is.are填空, 用is,am,are填空 用am,is,are填空. 用is.am are填空.1.Everyone___here.2.Sam__not here.He__at school 用 am is are have has 填空; My brother ( ) stundent.They ( ) an 用am,is,are,were,do,does填空what ()they often cat for dinner?;( 初中英语用am,is,are填空