Once, there was a little grey planet. People living on it hadn't looked after it well. A{#blank#}1{#/blank#} they had excellent inventions and spaceships beyond our imagination, they made the planet f_{#blank#}2{#/blank#} of rubbish and pollution. As a result, there were no plants or a{#blank#}3{#/blank#} left.

    One day, a little boy was walking on the p{#blank#}4{#/blank#}. When he passed a cave(山洞), he noticed a small red f{#blank#}5{#/blank#} in it. The flower was sick and almost dying. The boy d{#blank#}6{#/blank#}it out carefully with its root and some soil. Then he tried to find somewhere to plant it, but he failed. He looked up in the sky and he found the m{#blank#}7{#/blank#}. He thought the flower might grow w{#blank#}8{#/blank#} on the moon. So he climbed into a spaceship with the flower and f{#blank#}9{#/blank#} to the moon. He grew the flower on the moon and took care of it every day. Soon the flowers spread all over the moon and the moon was c{#blank#}10{#/blank#} with red flowers.

    When all the flowers come out, the moon looks r{#blank#}11{#/blank#} , like a warning light. If we don't look a{#blank#}12{#/blank#} our earth carefully, the day will come when flowers will only be able to grow on the moon.