I regret ______ those weight-loss pills, because I am now in hospital．
| A．to take | B．taking | C．taken | D．take |
--How are your recent trip to Sichuan?
—I’veneverhad ______ onebefore.
| A．apleasant | B．amorepleasant |
| C．amostpleasant | D．themostpleasant |
Shy people often avoid situationswould force them into close contact with other people．
| A．which | B．where | C．when | D．what |
—How long do you think it will be______man can finally solve the problem of cancer?
—Well，it depends
| A．when | B．until | C．after | D．before |
______ 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 |
This book is considered to be the best novel of its kind ever.
| A．to write | B．writing | C．having written | D．written |