Ⅰ. 单项选择(每小题2分，共20分)
1. Betty ________ eats junk food, so you see, she is pretty healthy.
A. usually B. often
C. always D. never
2. I can't eat any more food. I am________．
A. busy B. hungry
C. full D. serious
3. —________ do you have an art festival in your school?
—Once a year.
A. How long B. How often
C. How far D. How soon
