I have a tight budget for the trip，so I'm not going to fly ________ the airlines lower ticket prices.(2012·上海，32)
| A．once | B．if | C．after | D．unless |
— What’s your favourite sport?
Skiing. ____________.
| A．I get a kick out of it | B．I prefer it |
| C．I choose it | D．I’m used to it |
. In crowded streets, for the safety of people, it is ______ to drive faster than 20mph.
| A．forbidden | B．persuaded | C．required | D．demanded |
. Doctor Wang _____ at seven o’clock for the conference, but she didn’t turn up.
| A．should have arrived | B．should arrive |
| C．should be arrived | D．should be arriving |
Shanghai is really a fascinating city and we’ve decided to stay for ______ two weeks.
| A．another | B．other | C．the other | D．other’s |
．She is very dear to us. We have been prepared to doit takes to save her life.
| A．whichever | B．however | C．whatever | D．whoever |