that, what, which, who

Please choose the most appropriate answer for each sentence.
  • 1
    ......... is that sitting over there in the corner?
  • 2
    I don't understand a word ......... you are talking about.
  • 3
    They have a very large house round ......... there are some lovely gardens.
  • 4
    I'm looking at the photograph ......... you sent me with your letter.
  • 5
    There is a new television programme called: '......... wants to be a millionaire?'.
  • 6
    I think you will see that this is the best museum ......... you can find in the town.
  • 7
    The police want to find out ......... drove the red car into the shop window.
  • 8
    Did you meet the lady ......... uncle works in the library?
  • 9
    The person in the house next to mine knows someone ......... met the Queen.
  • 10
    The grass, ......... I cut every week, seems to grow very quickly.