John, can’t you be careful? You have _____ some figures in your calculations. [ ]

Newspapers, radios, the Internet can often help to solve problems by _____ attention to situations _____ help is really needed

Are you my new classmate —-Yes, ________

Never believe anything ______ any other person has believed it．

Have you been watching TV? Don’t _____ valuable time running. — I’m not. I’m tired now and only am taking a short break.[ ]