Solution:
Here are the completed sentences:
- My whole family love camping. We have a large tent which we all sleep in.
- We always like to stay at small campsites, preferably near the sea.
- I like most songs by Katy Perry, but my favourite track of hers is Roar.
- The Rolling Stones were the support act at last year's festival.
- We thought that the headliners was actually better than the headliners.
Answer: tent; campsites; track; support act; headliners.