10.This article says _______ is bad for our lungs.( )
| A. | smoke | B. | to smoke | C. | smoking |
9.-____ do you exercise in the gym?-Four times a week.( )
| A. | How long | B. | How often | C. | How many |
8.-Last week,Bill had ______ flu,and today he has______bad cold again.
-I'm so sorry to hear that.( )
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-I'm so sorry to hear that.( )
| A. | a; a | B. | a; the | C. | the; a |