What should I do， doctor？
healthy， you should take more exercise．（ ）
| A． |
Keep |
B． |
Keeping |
C． |
To keep |
There some good advice about how to reduce air pollution on the Intement．（ ）
A．areB．isC．have
I was writing a letter she was making a telephone call．（ ）
A．whileB．whenC．before
After dinner，he used to computer games，but now he gets used to ．（ ）
A．play，walkB．playing，walking
C．play，walking
He has failed times，but he won't give up a chance．（ ）
A．third，fourB．three，fourth
C．third，fourth
﹣What's matter with you？
﹣I have fever．（ ）
A．an，theB．the，/C．the，a