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out ______ water or ______ air.11. Tomorrow Mr. Smith will leave Paris, ______capital of______ France, for Washington by______ air.12. We were having______ lunch when they came in.13. This is ______ book you gave me last week.14. What did you do ______ last Saturday?15. March 8 is ______ Women39。s Day.16. If ______ weather is fine tomorrow, we will go to the park.17. I prefer playing ______ piano to playing ______ basketball.18. At ______ age of five, he read a lot of books.19. Tom an