21. It is pleasure for us to make a graduate address in presence of thousands of students in the graduation ceremony.
A. 不填; a B. the; 不填 C. a; the D. the; the
22. ----I’m frustrated after so many failures. I can’t see any hope.
----Behind every misfortune !
A. does an opportunity lie B. is an opportunity lying
C. lies an opportunity D. an opportunity lies
