Here are the correct forms filled in:

1. She **made** (make) **pay** (pay) back the money.
2. I closed my eyes and **imagined** (imagine) Tom **lying** (lie) on a deserted beach in the sunshine.
3. I mean **to buy** (buy) an evening paper but I didn’t see anyone **selling** (sell) them.
4. He heard the clock **strike** (strike) six and knew that it was time for him **to get** (get) up.
5. **Observing** (observe) the sun **climb** (climb) above the horizon at dawn makes one **realize** (realize) that the earth is indeed turning.
6. The teller **made** (make) him **lie** (lie) down on the floor.
7. It was disappointing to see the team **beaten** (beat) by weaker opposition.
8. She wants her paintings **to be displayed** (display) in the gallery, but we don’t think they’d be very popular.
9. We heard the play **performed** (perform) on the radio a few weeks ago.
10. I’d like your bedroom **to be tidied** (tidy) before I get home from work. It’s in a terrible mess.
11. I remember it distinctly. At 5:30 yesterday afternoon, I saw Jim **walking** (walk) to his car, **opening** (open) the door, and **getting** (get) in.
12. I made my son **wash** (wash) the windows before he could go outside to play.
13. We had a professional photographer **take** (take) pictures of everyone who participated in our wedding.
14. Don’t let me **forget** (forget) **to take** (take) my keys to the house with me.
15. It was very kind of my friend to help me **do** (do) the housework.
16. Tom: I can’t get my car **to start** (start) on cold mornings.
17. They let us **park** (park) motorcycles here but they won’t allow us **to park** (park) the car.
18. You shouldn’t get Jack **to type** (type) this letter. He’s a careless man.

Feel free to ask if you need further assistance!