Ответ:

1. When the class finished, I opened the door and walked out of the room.

2. Celia jumped off the rock into the water.

3. Megan came into the house and started to cook dinner.

4. When I was younger, I fell off my bike many times.

5. I don't enjoy mountain biking. I get very tired when I ride up the hills.

6. The thief jumped over the fence and tried to enter the house.

7. Don't walk under a ladder. It's bad luck.

8. We walked along the town and took some photographs.

9. Peter swam across the river to the other side.

10. Steve took a key out of his pocked and opened the door.

11. We didn't have a key, so we climbed through a window into the house.

12. She walked quietly along the corridor to take the elevator.

13. My little brother loves climbing up trees.

14. He decided to climb down the hill because it was getting dark.

15. They walked through the forest and arrived at a beautiful waterfall.