The teacher said that Columbus _______America in 1492.
A.discovered | B.found | C.had discovered | D.had found |
While watching television, ____.
A.the doorbell rang | B.we heard the doorbell ring |
C.there was someone knocking at the door | D.the doorbell was ringing |
I’ll have all of the readings ____ by the end of this term if my plan goes well.
A.completing | B.to complete | C.completed | D.being completed |
—How did it come that you damaged your car so badly?
—I ____into a tree on the roadside the other day.
A.ran | B.had run | C.was running | D.run |
Air pollution, together with littering, ____ many problems in our large industrial cities today.
A.causes | B.cause | C.caused | D.causing |
His advice made me happy, but ____others angry.
A.making | B.to make | C./ | D.make |