21. She reckons that you should have ______ minimum of three exercise classes a week to get any of _______benefits.
A. a; \ B. \;the C. the; the D. a; the
22.——What’s up, Mike? You look pale.
——Oh, I’m not feeling well in the stomach. I _______so much fried chicken just now.
A. shouldn’t eat B. mustn’t have eaten
C. shouldn’t have eaten D. mustn’t eat
