look at the picture,is__your sister?

look at the picture,is__your sister? Look at the picture. Look at the picture at,look,picture,the,please Look at the picture,the girl___. look at the picture,the boy___the tree. look at the picture ___ the policeman Look at the picture ( ) the classroom. look at the picture.The pupil( ) look at the picture还是looking look at the picture,please 改为祈使句! Look at the picture.(改为否定句)