19. I can't wait until we do some experiments in the science lab. (forward)
I'm really some experiments in the science lab.

20. Communication changed completely when the telephone was introduced. (with)
Communication changed completely the telephone.

21. Dr Frankenstein was finally successful in bringing the monster to life. (managed)
Dr Frankenstein the monster to life.

22. I can't understand how they built the Pyramids. (impossible)
I how they built the Pyramids.

23. Fleming discovered penicillin as a result of a little luck. (resulted)
A little luck penicillin.

24. People sometimes call nurses 'angels'. (known)
Nurses 'angels'.

25. Einstein eventually realised that he was wrong. (conclusion)
Einstein eventually that he was wrong.

26. Our physics teacher tried to explain the Theory of Relativity. (attempt)
Our physics teacher explaining the Theory of Relativity.

27. We'll save enough money and then we'll buy a computer. (soon)
We'll buy a computer saved enough money.