(¡¡¡¡)21. —Do you have____art festival this week?

—Yes, ____festival is really interesting.

A. a; the                                B. an; the 

C. the; an                               D. an; an

(¡¡¡¡)22. —My birthday is____July 10th. How about you?

—Well, my birthday is____October.

A. in; in                                B. on; on 

C. on; in                                D. in; on

(¡¡¡¡)23. —____is Mother's Day?

—It's on the second Sunday in May.

A. How             B. When               C. Who                  D. Where