根据句意，写出括号内所给单词的正确形式。
The train arrived at ___________________ (exact) 8 o’clock.
All the ___________ ( swim ) names are on the paper. You can have a look.
It’s wrong for some children to lose ____________ (they) in computer games.
The teacher changed some of the grades on my paper because she found them _____ ( correct ).