In the old days, people lived in caves and they had to make a fire _________themselves warm.
A. to keep B. keeping C. keep D. kept
At present, many people would rather ___________ in the country because there is _________ pollution in the city.
A. live/more B. to live/less C. live/less D. to live/more
---Your 12-year-old son doesn’t know much about shopping online, ________ he?
--- ___________, actually shopping online is popular with teenagers these days.
A. does/No B. does/Yes C. doesn’t/No D. doesn’t/Yes
--- I hope Jim won’t mind lending you his new digital camera.
--- He ___________. I have already borrowed one from my cousin, David.
A. shouldn’t B. mustn’t C. needn’t D. can’t
---Everybody is playing on the playground. Can I join them , Miss Lin?
--- __________________ Not until you have completed the Maths exercises.
A. Why not? B. Will you? C. I hope so. D. I’m afraid not.
--- Mrs. Brown, I don’t think we can get there on time by bike.
--- You mean it’s ___________ for us to take a taxi?
A. necessary B. important C. possible D. difficult
