( )26. What is Time-Space Post Office made up of?
A. Many kinds of postcards.
B. Letters from old visitors.
C. Suggestions from the visitors.
D. Problems visitors can't understand.
( )27. Why was the writer afraid to talk with the visitors in the beginning?
A. He was very nervous.
B. The visitors were unfriendly.
C. He knew little about the show.
D. He had no experience in volunteering.
( )28. What may the writer do in the near future?
A. Work in a post office.
B. Never be nervous again.
C. Continue to be a volunteer.
D. Become a part of this show.

26. B
27. A
28. C