—Ann is in hospital.— Really? I _____ know. I ______ go and visit her.
You'd better not have the lights _____ all day long.
_____ the same mistake again made his parents very angry.
She said she was sorry _____ the train, so she had to stay here for another day.
Although swimming is his favorite sport, yet he doesn't like _____ today.
Saying always has less difficulty than _____.