14. I’m not sure if that’s a good idea.

13. lie on the floor

12. check to tickets

11. on a train (plane, bus, ship, bike) = by train (plane, bus, ship, bike)

　 in one’s car = by car

10. He didn’t know what to do. / how to do it.

9. a friend of his = one of his friends

8. play jokes on sb. = make fun of sb.　 / A joke was played on sb.

7. make sb. do sth.

6. She’s almost (=nearly) as tall as woman over there.

5. I’m not sure, either.