Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A.are being uncovered | B.have been uncovering |
C.are uncovering | D.have uncovered |
_______ time, he’ll make a first-class tennis player.
A.Having given | B.To give | C.Giving | D.Given |
Remember _______ off the light when _______ to bed.
A.turning, going | B.to turn, to go | C.turning, to go | D.to turn, going |
Stop _______ me to hurry up. I can only go so fast.
A.to tell | B.telling | C.to have told | D.having told |
Certainly I posted your letter — I remember ______ it.
A.posting | B.to post | C.to be posting | D.have posted |
Please remember _______ the plants while I’m away.
A.watering | B.to be watering | C.to water | D.being watering |