题目内容：

food   few  out   through   himself

An old scientist recently made several tests with different animals. He wanted to find1. which was cleverer than other animals.

In one test he put a monkey in a room where there were several boxes. Some boxes were inside other boxes.One small box had some2. in it. The scientist wanted to know how long it would take the monkey to find the food. The scientist left the room. He waited a3. minutes outside the door. Then he got down on his knees and put his eyes to the keyhole. What did he see? To his surprise, he found 4. looking into the eye of the monkey. The monkey was on the other side of the door and looked at the scientist5. the keyhole.