21. Attracting senior citizens, Florida is home to the largest population of elder Americans.
A.不填；不填 B. the; the C. the; 不填 D.不填；a
22. ______ the children to bed, she began to correct the students’ exercises.
A. Sending B. Being sent C. Sent D. Having sent
23. ---How was Robert's cooking?
---Oh, pretty good. I was quite .
A. admired B. interested C. impressed D. inspired
