---I think ______ people drive, ______ air pollution there will be.---That’s true. I hope the air will be fresher soon.
This educational CD-ROM makes _____ easier for you to learn English. After using it for a month, you’ll have no difficulty ________ with foreigners.
--- Can I walk across the road now, Mrs. Chen? ---No, you ______. You have to wait until the light turns green.
--- Middle school students hardly know anything about shopping online, __________ they? --- ________. It’s very popular with teenagers.
--- Are you happy with your grades in the math exam? ---Not at all. I can’t have _______.
I have a ______ friend. He has lived in the _____ island for half a year to do some research.