On a{#blank#}1{#/blank#}(freeze) cold day,Mrs Smith's dog was hungry,but there was not any meat{#blank#}2{#/blank#}(leave) in the house.

    {#blank#}3{#/blank#} (consider) there was no better way,Mrs Smith took a piece of paper,and wrote the{#blank#}4{#/blank#}(follow) words: “Give my dog half a pound of meat.”Then she asked her dog to take it to the butcher's.When the butcher recognized that it was really the lady's handwriting,he did as he{#blank#}5{#/blank#}(ask) to.The dog was very happy,and ate the meat up immediately.

    The next day,the dog came again exactly at midday.And as{#blank#}6{#/blank#}(usually),it brought a piece of paper in the mouth.This time the butcher did not take a look at the paper,and just gave the dog its meat,for he had regarded the dog{#blank#}7{#/blank#}one of his customers.

    One day later,to the butcher's more surprise,it came at six o'clock and brought{#blank#}8{#/blank#}third piece of paper.Though {#blank#}9{#/blank#}(surprise),the butcher gave him{#blank#}10{#/blank#}he wanted.But what he didn't know was,that there were not any words on the paper!

The college entrance examination is just around the corner. {#blank#}1{#/blank#} (assign) and tests will keep many of you up late at night, and you may plan to make up for your{#blank#}2{#/blank#} (lose) sleep during the weekends. But is it useful?

A study shows that the habit of sleeping in{#blank#}3{#/blank#} weekends doesn't fix the damage done by a lack of sleep during the week. Even {#blank#}4{#/blank#} (bad), it may damage your health.

In the study, {#blank#}5{#/blank#} was conducted over 10 days, 36 healthy young men and women with different sleep requirements {#blank#}6{#/blank#} (divide) into three groups. The researchers found that people who lacked sleep ate more snacks and gained {#blank#}7{#/blank#} (weigh) quickly. That could be partially due to the shifting of the{#blank#}8{#/blank#} (biology) clock and changes to certain body hormones especially hunger hormones.

And {#blank#}9{#/blank#} they tried to sleep for as long as they wanted to on weekend, it was still insufficient(不够的) to meet standard sleep time because they found it difficult to fall asleep. Moreover, they were more likely{#blank#}10{#/blank#}(show) increased sensitivity (敏感性) to insulin(胰岛素) in both their muscles and their livers.