Do you know group-buying online?Yes,the price is ( )but credit is not( ）A.cheap ,good B.high,well C.expensive,well D.low ,good

do you learn English ( )studying ( ) a group? what do you know Do you know what Do you know Facebook? do you know my how do you know Do you know Do you know? do you know 亲,Do you know? Do you know what? do you know there? do you know sex How do you know? Do you know? do you know these Do you know do you know是什么意思