The door is still closed. He _____ the key.
| A．musthavelost | B．mustlose | C．needhavelost | D．canlost |
The problem was very difficult to handle．We worked it out，__________ ．
| A．too | B．yet | C．although | D．though |
—Can I pay the bill by check?
—Sorry，sir．But it's the management rules of our hotel that paymentbe made in cash．
| A．shall | B．need | C．will | D．can |
Helen was much kinder to her youngest child than she was to the others，，of course，made the others jealous．
| A．who | B．that | C．which | D．what |
is known to us is that tobacco contains nicotine and other harmful products，so you should give up smoking．
| A．As | B．It | C．What | D．Which |
——Which of the two souvenirs do you like better?
——blue one．of course．I think it's reallymost instructive one．
| A．A；the | B．The；the | C．The；a | D．A；a |