阅读下列材料，在空白处填入适当的内容或括号内单词的正确形式。
Once there lived a rich man 61 wanted to do something for the people of his town. 62 first he wanted to find out whether they deserved his help.
In the centre of the main road into the town, he placed a very large stone. Then he 63 (hide ) behind a tree and waited. Soon an old man came along with his cow.
“Who put this stone in the centre of the road?” said 64 old man, but he did not try to remove the stone. Instead, with some difficulty he passed around the stone and continued on his way. 65 man came along and did the same thing; then another came ,and another. All of them complained about the stone but not tried to remove 66 . Late in the afternoon a young man came along. He saw the stone, 67 (say) to himself: “The night 68 (be) very dark. Some neighbors will come along later in the dark and will fall against the stone.”
Then he began to move the stone. He pushed and pulled with all his 69 (strong) to move it. How great was his surprise at last! 70 the stone, he found a bag of money.