--- Why did you buy two pairs of shoes?--- It was so hard to choose which was________, so I took them both.
—Can we run across the road now?—No,we ________.We have to wait until the light turns green.
—May I play computer games now,Mom?—No.You ________ finish your homework first.
—May I take some pictures here?—Sorry,you mustn’t.Please look at the sign.It says“________”.A.NO PHOTOSB.NO TALKINGC.DANGER
Hurry up,or you ________ catch the train.
—Must I hand it in today?—No,you ________.You can do it tomorrow.A.mustn’tB.can’tC.needn’t