They must have been enjoying themselves there，or they __________ so long．
| A．wouldn’t stay | B．needn’t have stayed |
| C．wouldn’t have stayed | D．couldn’t stay |
With the price of ______ petrol rising, the bicycle may become ______ popular means of transportation again.
| A．the; a | B．the; the | C．/; a | D．/; the |
________all kinds of difficulties，the workers have made rapid progress in the construction of the World Expo 2010 Shanghai．
| A．With | B．For | C．Under | D．Beyond |
_______of the household rubbish________recycled or reused since the new technology was applied.
| A．Three-fourth; has | B．Three-fourth; have been |
| C．Three-fourths; has been | D．Three-fourths; have |
Health problems are closely connected with bad eating habits and a________of exercise.
| A．limit | B．lack | C．need | D．demand |
---Could I borrow your car for a while?
--- _________. I won’t use it today.
| A．By all means | B．Of course you could |
| C．You are welcome | D．Never mind |