Here are the correct answers:

From which club did QPR sign Tommy Smith?
Portsmouth

Who were QPR’s opponents for the final league match on the artificial pitch at Loftus Road?
Sheffield Wednesday

Who scored the first league goal on the newly-laid grass pitch the following season?
Matthew Le Tissier

QPR first moved to Loftus Road in which year?
1917

Which team had played there before then?
Shepherd’s Bush FC