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

    One day， a little boy was walking on the （4）p　　． When he passed a cave（山洞）， he noticed a small red（5）f　　 in it． The flower was sick and almost dying． The boy （6）d　　 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 （7）m　　． He thought the flower might grow（8）w　　 on the moon． So he climbed into a spaceship with the flower and （9）f　　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（10）c　　with red flowers．

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