21.While ________ the meal, some talented students gave a wonderful folk dance performance, ________ the elderly very happy.

A. enjoyed, making     B. enjoying, making    C. to enjoy, making   D. enjoying, to make

22.His father _________ him for his rudeness, for Tom looked happy.

A. could have forgiven                B. might have forgiven

C. must forgive                      D. must have forgiven