21. It is ___ great pleasure to go to ____cinema after a week’s hard work.
A. a; a B. the; a C. a; / D. a; the
22. ——Why was Professor Smith unhappy recently?
——Because the theory he insisted on _______ wrong.
A. proved B. proving C. being proved D. was proved
23. As we have much time left, let’s discuss the matter tea and cake.
A. over B. with C. by D. at
