1、i was watching the football match on TV when mum came in同义

1、i was watching the football match on TV when mum came in同义句转换
mum came in while ____ ____ _____ the football match on TV
2、you should do your homework as carefully as possible
you should do your homework as carefully as ____ _____
3、the train was late because there was a thick fog
the train was late ______ _______ a thick fog