A man was walking through a forest. He was{#blank#}1{#/blank#} an axe in his hand. A little tree stopped him and said, "Please use your axe to cut down those{#blank#}2{#/blank#}trees, my friend. Because of them, the sunlight cannot fall on me, and I have no room at all to{#blank#}3{#/blank#}myself. Without them, I'll be the pride of this part of the forest. "

    The man decided to help the little tree. He used his axe to cut down the trees. Then the little tree had enough room. The little tree felt happy and said thanks to the man. When the Sun came out, the little tree{#blank#}4{#/blank#}water and it became very thirsty. Later when a storm came, the little tree lost all its leaves and branches(树枝).

    Many students aren't getting enough sleep at night, which means they end up feeling {#blank#}1{#/blank#} during class. Taking a nap (小睡) during the day may be a solution.

    According to Forbes, a nap can clear your mind, {#blank#}2{#/blank#} your energy and help you study even {#blank#}3{#/blank#}. But how long should a nap last? "The proper time should be between 10 and 30 {#blank#}4{#/blank#}," Peter Venn, a sleep expert said.

    Sleeping for a short time, such as five minutes or so, is not helpful. That's just not enough time {#blank#}5{#/blank#}.But if you sleep for a long time, you may wake up feeling uncomfortable.