21. --Shall I have another look at the flat and tell you more about it?
--__________. I’ll telephone the salesgirl for details myself later.
A. Go ahead B. Good chance C. Don’t bother D. It depends
22. Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.
A. so that B. in case C. even if D. as though
