We must be back at the school by seven o,clock .We _______be late

We must be back at the school by seven o,clock .We _______be late Don't s____ at the old people.We must be polite. we must study english hard or we can't be good at it,反义疑问句说明道理 ()late,boys!We must leave at eight tomorrow morninga.Don'tb.Can'tc.Don't bed.Can't be Don't throw things （through/cross）the windows(On/In)a cold morning,we arrived at the small villageIf you hurry up,we may(be able to/must)get to the airport in time What he said is really(disppointing/disppointed)My mother will be back(at/by) noon we are very happy to be back at WE WILL BE BACK We will be back! The engineer must be at home,for the light is on,___?A.mustn't heB.isn't hewhy we choose B? be back in be back at 区别 Linda must ___(be) at home now.I saw her coming back The children must be back at ten o‘clock（变否定句） we must be at the station to meet her为啥要加be?we must be at the station to meet 为啥要叫be 去掉行不行? knowing is't enough be wonder we must apply be must apply wound is't enough who is next we must doknowing is not enough be wonderwe must apply be must applywound is not enough who is nextwe must do We must be here ( ) tomorrow morning.A.six B.at six C.at sixth It's too late.We can't go back.We must find a h___ to live in. ---Must we come back before five?--No,you___.You may come back before six if you likeA.mustn't B.needn't C.can't D.may not be back at school是什么意思