21. - What do you know about _______event?
- It's one of _______China's biggest fund-raising events.
A. an; / B. the; the C. the;£¯ D. an; the
22. The patients are quite _______the nurses for their special care.
A. thanks to B. thankful for C. grateful to D. grateful for
23. - Will you come to the party?
-_______you also invite Blade.
A. Even though B. Only if C. If not D. In fact
24. - Is your father a teacher?
- Well, he_______.