Could you go ______ what you have done, for the sake of the students who were late？A．onB．o

——Sorry，do you mind if I smoke here？——Yes，____________． A．you could B．go ahead

– I failed it. －－_____________.A、When？B、How could you？C、You should fail it.D、What a pity

— I usually go there by train.— _________________A、You could do more training.B、The boat

You needn t ______ the class to tell me that: you could have come up to me afterwards.A．ha

Speaker A: Could I get a ride with you to the concert tonight？ Speaker B:I cant go,______.

-What can I do for you?-_________A.Let me have a watch.B.Could you show me the watch?C.