Choose the correct answer.

25. Did someone help Alison or did she do all the calculations __________?
A) her  B) hers  C) herself

26. That's not your calculator. It’s __________.
A) me  B) mine  C) my

27. Einstein is the person __________showed that time can speed up and slow down.
A) which  B) who  C) whose

28. Do you know __________idea it was? Was it Greg's or Fiona’s?
A) who  B) which  C) whose

29. This is the laboratory __________we do all the experiments.
A) that  B) which  C) where

30. Novosibirsk, __________is a big city in Siberia, is famous for its university.
A) who  B) which  C) where

31. That's the girl __________father says he's invented a time machine!
A) who  B) whose  C) that

32. Is this our DVD or is it __________?
A) them  B) their  C) theirs