A. in B. on C. at D. to

( )17. September is the ___ month of a year.

　A. nineth B. nine C. ninth D. nineteenth

( )18.___ is the fourth month of a year.

　A. January B. February C. March D. April

( )19. There are ___ months in a year.

　　　A. twenty B. twelve C. twelfth D. twentieth

( )20.---____ is New Year's Day? ---It's January 1st.

　　A. What B. When C. How D. Which

( )21. Sunday is the ___ day of a week.

　　A. third B. second C. first D. last

( )22. This is our ___ test this term.

　　A. three B. third C. the third D. No. 3

( )23. Students don't go to school ___ Sundays.

　　A. in B. at C. on D. to

( )24. Is it ___ today?

A. Mother's Day B. Mothers' Day C. Mothers