Candidates ______ remain in their seats until all the papers have been collected.
| A．must | B．shall | C．may | D．can |
After the explosion，the roads are full of ________people leaving the city.
| A．afraid | B．frightened | C．frightening | D．scary |
—Time ________. It’s likely that we’ll miss the deadline.
—Don’t worry. We have already got through 80% of the job.
| A．is running out | B．has run out | C．is being running out | D．has been run out |
Always read the ________on the bottle carefully and take the right amount of medicine.
| A．instructions | B．descriptions | C．introductions | D．explanations |
—Are you free after school?
—Sorry. I’ve planned to treat a friend of mine to dinner ________for his help.
| A．in addition | B．in turn | C．in return | D．in total |
It is the fourth time that she ________you in a week.
| A．rings | B．has rung | C．has been ringing | D．is ringing |