— ______people travel every year?
— Perhaps when we are talking about it. More than 100 planes have taken off around the world.
| A．How many | B．How much | C．How long | D．How often |
Mary___________ computer science last year.
| A．studies | B．studied | C．will study | D．studying |
In ten years, John __________ an astronaut.
| A．will be | B．is | C．was | D．be |
According to the latest reports on TV and in the newspaper, food safety is becoming a ____________ serious worldwide problem.
| A．more and more | B．little by little | C．now and then | D．one by one |
Drugs can do great harm (危害) not only to you but also to your family. You must be _________them.
| A．along with | B．out of | C．in front of | D．away from |
—You’re supposed to hand in the travel diary as soon as possible.
—I see. I’m going to _________until 11:30 pm once more.
| A．cheer up | B．put up | C．turn up | D．stay up |