I like buying food in the supermarket, because it offers the ________ at the ________ price.

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Tom is the son of a farm owner. One New Year’s Day, when he was 15 ,his father   16 him to work on the farm for one year when he was free. Tom was   17  with his father’s idea. “That isn't my job. I have  18   school work to do. ” Hearing this, his father said, “I promise (许诺) to give you the best present(礼物） if you  19  finish one year’s work. ” Tom thought for a while and  20 .

Starting one Saturday, the boy got up early and worked   21  until evening, just like any other farmer. Time passed quickly. Tom’s crops (庄稼) grew well.  22 the last day of the year, the father said, “I’m happy to see that you have worked very hard the whole year. Now, tell me  23  you want. ”

The boy smiled and showed his father a big piece of bread made from his wheat(小麦). “I’ve already got the  24  present. No pains, no gains（不劳无获）. I think this is what you wanted   25  to know. ” His father was quite pleased to hear that.

You may know about “ junk food” like French fries. But do you know about “junk sleep”?
Recently, a British survey found that electronic(电子) products in teenagers bedrooms are affecting(影响)their sleep.
The survey was done among 1,000 British kids from 12 to 16. It found that thirty percent of them got just 4 to 7 hours sleep every day. But doctors say they need 8 to 9 hours.
Almost a quarter of the kids said they fell asleep more than once a week while watching TV, listening to music or using other electronic products.
“This is very worrying.” Said Dr Chris Idzikowski, a British expert, “We call it ‘junk sleep’, It means you don’t get enough sleep and the quality of the sleep is bad, too. If you don’t get good rest, you don’t perform well in school the next day.”
The survey found that 40 percent of the kids felt tired each day, with girls between 13 and 16 feeling the worst. Nearly all the teenagers have a phone, Mp4 or TV IN THEIR BEDROOM. And many of them have all three.
【小题1】 This passage is mainly about______.