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

Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.[ ]

______is known to us all, only the theory ______ onpractice can be practical.

(2012·上海高考)The new law states that people ________ drive after drinking alcohol.

Can I help you with it— Thank you for your ______, but I can do it myself.