The problem is difficult for me work out.
| A．very; to | B．enough; to | C．so; that | D．too; to |
The population problem may be ______ one of the world today.
| A．the most | B．most difficult | C．the greatest | D．more interesting |
Don’t ______ so often. It’s bad for your health.
| A．get up | B．stay up | C．look up | D．come up |
—Mum, when can I watch TV?
—As soon as your homework ______.
| A．finish | B．finished | C．is finished | D．will be finished |
—I hear Mr. Zhang has gone to Beijing for a meeting.
—Really? Do you know when he ______?
| A．leaves | B．was leaving | C．has left | D．left |
—I want a ticket to Shanghai this afternoon, please.
—OK. Will you please ______ me your ID card?
| A．tell | B．serve | C．send | D．show |