they sat in the room _____ doing their homework.

they sat in the room _____ doing their homework. they are doing their _____(homework) in the classroom the twin brothers are doing t___ homework in the room The students were busy doing their homework,only____ once in The children ( ) doing their homework. The children are doing _____（they）homework They -------(get）their things ready in the room .they -----( the are doing their homework.对doing their homework提问 They are doing their homework?对doing their They have been doing their homework they don't doing their homework now. They were doing their homework when I came in.改( 为否定句) They