The sign means"Be quiet"!We__make noise here A.shouldn't B.should C.must2.In half an hour hr was fast____.A.sleep B.asleep C.sleeping

the sign means: The sign on the birds'cage means ‘Be quiet'. （改为一般疑问句） 'danger',the,sign,building,on,the,means(.) the sign means “No____(音乐）!” the road sign means no____ (cross) 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 means “Keep off the grass.”(改为同意句)The sign means we ____ _____ ____ the grass The sign means keep off the grass改为同义句 The sign means we___ ___ _the grass The sign No smoking means we mustn't smoke here the sign means 'Danger'!(改一般疑问句）急急急! the sign means “no smoking”对no smoking提问 the sign means“ ”（danger）.填什么,为什么 the sign means “no litttering“（一般疑问句） The sign means No littering换成否定句 What does the sign meas?It means No t____