阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

　　Once a mall was walking along a beach. The sun was shining and it was a beautiful day.　6l　 the distance he could see a person going back and forth between the surf’s edge and the beach. As the man 　62　（approach）, he could see there were hundreds of starfish 　63　（1ie）on the sand as a result of the natural 　64　（act）of the tide.

　　The man 　65　（stick）by the apparent uselessness of the task. There were far too many starfish 　66　 many of them were sure to die. When he came near, the person continued the task of picking 　67　 the starfish one by one and throwing them into the ocean.

　　As he came up to the person, he said. “You must be crazy. There are thousands of miles of beach 　68　(cover) with starfish. You can’t 　69　（possible）make a difference.” The person looked at the man. He then bent down and picked up 　70　 more starfish and threw it back into the ocean. He turned back to the man and said, “It surely makes a difference to that one!”