Choose the underlined part.
1. Collecting coins is exciting, but it can also be relaxed.
2. Cloud watching sound weird, but Hằng adores it.
3. For some young people, enjoyment involves sitting in front a computer playing games.
4. His parents are thinking of banning him on using the computer.
4, on -> from
1. relaxed -> relaxing
2 sound -> sounds
3, in front -> in front of