—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
______ by a greater demand of vegetables, farmers have built more green houses.
A. Driven B. Being driven C. To drive D. Having driven
