1. Chicago is __________ seven hours from here.

2. Airplanes fly __________ the ground.

3. The class starts __________ 7:30 in the morning.

4. We haven’t been there __________ last year.

5. The plane is leaving _______ ten minutes.

6. I’ll be there ________ an hour.

7. I am standing _______ the ground.

8. The students walked ________ the classroom.

9. Do you want to go _______ a walk?

10. Did you finish your work ______ time?

11. I need to go ________ the store.

12. The young man climbed __________ the window.

13. Can I borrow your pencil _________ a minute?

14. Subway trains travel __________ the ground.

15. I had to make a stop ________ New York last night.

16. Earthworms live __________ the ground.

17. Sit __________.

18. I woke up ________ 5:30 this morning.

19. The cat jumped __________ the fence.

20. I have lived in USA ________ many years.