17. I prefer playing ______ piano to playing ______ basketball.

16. If ______ weather is fine tomorrow, we will go to the park.

15. March 8 is ______ Women's Day.

14. What did you do ______ last Saturday?

13. This is ______ book you gave me last week.

12. We were having______ lunch when they came in.

11. Tomorrow Mr. Smith will leave Paris, ______capital of______ France, for Washington by______ air.

10. We can't live without ______ water or ______ air.

9. John is______ cleverest boy in his class.

8. In ______ winter it is cold in ______ Beijing and warm in ________Shanghai.