( )1._____ I was talking on the telephone, David came in.
A.Because B.While C.If
（ ）2. —Will there be more people in 100 years, do you think? —___ ,I hope.
A. No, there isn’t B. No, there aren’t
C. No, there won’t D. No, they won’t.
（ ）3. —Do you like the city life or the country life?
—It’s hard to say. In the city there is ___ __fun, but in the country there is _____ po llution.
A. less; more B. more; less
C. more; fewer D. much; much
