14. Many students at school.....with fly last month.
A. went down
B. went off
C. went out
D. went under
15. Let's buy it,...we?
A. shan't we
B. do
C. can
D. will
16. I will give a.....of $100 to the person who will find my lost dog.
A. fee
B. prize
C. reward
D. price
17. ......entering the classroom, he found everyone satring at him.
A. As
B. At
C. In
D. On
18. We looked everywhere, but she was nowhere.....
A. to see
B. seen
C. to be seen
D. having seen
19. My brother has changed so much since he.....in love with Betty.
A. has fallen
B. has fell
C. fell
D. fallen