— Has Jack finished his homework yet?
— I have no idea；he ＿＿it this morning.
A. was doing B. had been doing C. has done D. did
______ leaves the room last ought to make sure that the windows are closed and the door locked.
A. Whoever B. Who C. Who will D. Those who
We should think of ways to stop the waste from the factory _____ our living environment.
A. being pollutedB. pollutingC. from being pollutedD. polluted
The mistakes made by Chinese students are quite different from ________made by the Japanese students in English study.
A. That B. which C. what D. those
___ are very deligent.
A. Both the girls B.Both they C.The both girls D.They of both
Having been born on the earth, we had no choice but ________ hospitality it offered.
A. to accept that B. accept how C. to accept what D. accept what
