21. All of _____ sudden, I caught ______ sight of my teachers and classmates in the crowd, and then I felt much more calm.
A. a; / B. /; / C. a; a D. /; a
22. The house rent is expensive. I've got about half the space I had at home and I'm paying _______ here.
A. as three times much B. as much three times
C. much as three times D. three times as much
