---May I go and play with Tom this afternoon, mum? ---No.You can’t go out ______ your homework is being done.
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 _____.