Once there was a man named Tom. His eyes were in great pain. He visited the best doctors in the world. He also tried different kinds of medicine.{#blank#}1{#/blank#} nothing helped. One day, Tom met a famous eye doctor. He advised the man to look {#blank#}2{#/blank#}only green things for a long time.

    It was a very strange {#blank#}3{#/blank#} (suggest), but Tom wanted to try it. He {#blank#}4{#/blank#}(buy) boxes of green paint and painted everything green in his house. To his surprise, it {#blank#}5{#/blank#} (real) worked! The pain was starting to go away.

    Several weeks later, {#blank#}6{#/blank#} friend in white visited Tom. While he {#blank#}7{#/blank#}(walk) towards Tom's house, Tom came running with a box of green paint and poured(倾倒) all the paint on him. The friend was very angry. Tom first said sorry to {#blank#}8{#/blank#}(he), and then said that he had to do this -- because he needed {#blank#}9{#/blank#}(see) green things only.

    The friend laughed(大笑) aloud after hearing that. "Why did you paint everything green?" he asked. "It would be much {#blank#}10{#/blank#}(easy) if you put on a pair of green glasses! You can paint all things green, but you cannot paint the whole world green!"