Nowadays certain limit should be set on use of cars to reduce air pollution.
| A．/; the | B．a; the | C．the; / | D．the; the |
The result of the experiment was very good, ___________ we hadn’t expected.
| A．as | B．that | C．which | D．what |
—— What can I do for you?
——I’d like to buy a gift for my mother’s birthday, one at _________ proper price but of ___________ use and it’d better be __________ surprise.
| A．the; /; a | B．the; a ; / | C．a; the; / | D．a; / ; a |
___________ healthy, with easy access to affordable medical care, is still a dream for many people with medicine prices ___________ sharply.
| A．Keep; rise | B．Keeping; rising |
| C．To keep; risen | D．Having kept; to rise |
A foreign language like English is difficult to learn, so you ____________ work too hard.
| A．can’t | B．must | C．shouldn’t | D．ought to |
Mr. Smith works as a government official now, but he ____________ in a middle school for 5 years.
| A．has worked | B．worked | C．had worked | D．had been working |