50. John is on the bottle again. This sentence probably means _____.
| A．John is standing on a bottle now. | B．John is holding a bottle now. |
| C．John threw away a bottle. | D．John begins to drink wine again. |
—Where _____ Mary have put the empty bottles?
— She _____ them away. They must be somewhere.
| A．can; can’t have thrown | B．must; needn’t |
| C．must; must have thrown | D．can; mustn’t have thrown |
He failed in the exams and only then _____ how much time he had wasted.
| A．he realized | B．did he realize | C．he had realized | D．had he realized |
This ticket _____ one adult and one child to the show.
| A．promises | B．enters | C．admits | D．includes |
— Isn’t it hard to drive downtown to work?
—Yeah, that’s why I ______ to work by train.
| A．have gone | B．have been going | C．was going | D．will have gone |
— Shall we go and have a picnic at the weekend?
— ______. According to the weather forecast, there might be a cold front by then．
| A．Why not | B．We can wait | C．No, let's not | D．It depends |