Many migrant workers, city life, wouldn’t like to move back to the countryside.
| A．accustomed to | B．being accustomed to |
| C．have accustomed to | D．have been accustomed to |
—Shall I lock the lab now before I go home ?
—__________ . I’ll check it myself later.
| A．Don’t bother | B．No problem | C．No hurry | D．Go ahead |
—Really? Who will give _________ lecture?
— Mr. Wang, ________ professor from Nanjing University.
| A．the; 不填 | B．a; the | C．the; a | D．a; a |
This problem is said_____ three times at the meeting. However, they haven’t arrived at a conclusion now.
| A．to have discussed | B．to have been discussed |
| C．having been discussed | D．having discussed |
At present there is a fierce debate over the question_______ human cloning should be allowed.
| A．that | B．whether | C．what | D．if |
You have taken a hell of a risk and suffered a great deal, but you should believe it will ____sooner or later.
| A．pay back | B．pay up | C．pay off | D．pay down |