21. Who can take part in the Curiosity Challenge?
A. School students.
B. Cambridge locals.
C. CSF winners.
D. MIT artists.
22. When will the prize-giving ceremony be held?
A. On February 8th.
B. On March 10th.
C. On March 15th
D. On April 21st.
23. What type of writing is this text?
A .An exhibition guide.
B. An art show review.
C. An announcement.
D. An official report.