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4.If you want to keep the air in your room fresh, you can keep some green ______ in it.

5. Every passenger must bear in mind(牢记） that ________ the drivers in the bus is not allowed.

6. Tony has slept _______ than eight hours for preparing for the final test recently.

7. Many young people are looking forward to _______ in the new flats owned by themselves.

8. The programme covers different sports, ______ swimming, basketball and football.

9 Together with two other classmates, he _____ finished the difficult project perfectly.

10  Thank you for _______ my son during the past three years in the school.

11. Which country has the _______ population in the world, China, India or Canada?

12. Jack really enjoys ________ movies, especially action movies.

13. We _______ hours, but we failed to find my bike. I guess someone must have taken it by mistake.