Passengers, don’t occupy the chairs with your luggage, ?
| A．don’t you | B．will they | C．don’t they | D．will you |
Everyone present at the meeting agreed to stick to the ________that everyone should be treated fairly.
| A．purpose | B．ambition | C．principle | D．level |
Using _____ illegal drugs can lead to health problems, and it can be _____ stain on one’s life.
| A．不填；the | B．the; the | C．the; a | D．不填； a |
—Sorry indeed, I ________ to your birthday party if …
—Forget it. I know you were out on business.
| A．must come | B．would come | C．must have come | D．would have come |
—Another cup of coffee? That’s your third since lunch.
—Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.
| A．stayed up | B．have stayed up | C．have been staying up | D．will stay up |
—What’s up? You look down. —I have piles of papers ________, but I type so slowly.
| A．to be typed | B．typed | C．to type | D．being typed |