The sign means we should not (litter/littering)应该选什么?

the sign means: The sign No smoking means we mustn't smoke here The sign means “Keep off the grass.”(改为同意句)The sign means we ____ _____ ____ the grass The sign means we can go out here改为否定句 This sign [ ] [ ] we can go out here The sign on the birds' cage means we should keep quiet 否定句 The sign means we shouldn't walk on the grass（同义句） the sign (over there) means we should keep quiet对画括号的提问 The sign means we should not (litter/littering)应该选什么? A:Does the sign mean''Danger''?B:No,it[ ].It means we shouldn't[ ]or[ ]here. 'danger',the,sign,building,on,the,means(.) the sign means “No____(音乐）!” the road sign means no____ (cross) the sign on the wall means No----.We shouldn't ----here.a.smoking,smoke b.smoke,smokeing c.smo The sign means Keep off the grass.改为同义句 What does the sign on the wall means?改错 the big sign means undergrund.The big（提问） the sign beside the door means wet floor The sign（on the grass）means we shouldn't walk on the grass 划线部分提问Please give the man the camera.同义句