If you don’t wait _______ the red light, you will be punished by the policeman.
| A．at | B．under | C．for | D．on |
—The guard keeps watch at the gate.
—So he does. Only those knows well could be let in.
| A．close; who | B．tight; whom | C．tight; that | D．close; he |
He _______ have escaped, but he chose to stay and fight.
| A．must | B．could | C．will | D．need |
_______, according to the instructions, the medicine, I think, will work on your headache before long.
| A．Take | B．Being taking | C．Taken | D．Taking |
Only after spending several nights working on the math problem to wonder whether the problem was wrongly set.
| A．had he begun | B．he began | C．did he begin | D．began he |
I can’t persuade him out of playing computer games. He is to them.
| A．reminded | B．accustomed | C．addicted | D．stuck |