21.As we all know,______life is a big stage,on which_____things of all kinds can take place.
A.不填；不填 B.the; 不填 C.the;the D.不填；the
22,---Shall we phone Mary and say sorry to her?
--- ____ It was our fault.
A.No way. B.Why not? C.Not at all. D.Not possible.
