21．（2011·南昌模拟）Even on a cold day he prefers _____ out to play football _____ at home.
A. going; rather stay B. going; to staying
C. to go; rather than staying D. to go; rather than to stay
22.（2011·合肥模拟）He can’t be at home now, for I saw him _____ in the gym just now.
A. giving out B. working out
C. carrying out D. bringing out
