We all know trees play an important role in _______up the air.
A. clean B. cleaning
C. cleaned D. Cleans
Lucy and Lily are twins, but they are different _____each other in many ways.
A. of B. from C. with D. In
It is necessary for students ______ good studying habits.
A. to have B. having
C. have D. with having
--I think people here are friendly. Do you _______me?
--Yes, you are right.
A.play with B. look at
C. agree with D. laugh at
Yangtze River is one of ______rivers in the world.
A. big B. bigger
C. biggest D. the biggest
--Would you like some chocolate?
--No, thanks. I ______ eat chocolate. It is bad for my health.
A.almost B. hardly
C. already D. Usually