Long long ago, an old scientist made a few tests on different animals to find out which was the cleverest of all the animals.
In one test the old scientist put a monkey in a room. In the room there were many boxes. Some boxes were inside other boxes. The smallest box had some food in it. The scientist wanted to watch the monkey and to find out how long it would take the monkey to find the food. The scientist left the room. He waited for a few minutes outside the door. Then he put his eye to the keyhole(钥匙孔). What did he see? To his surprise, he found himself looking into the eye of the monkey. The monkey was on the other side of the door and looked at the scientist through the keyhole.  
The scientist wanted to know ____.

A．if the monkey came into the small box	B．if the monkey would sleep
C．which animal was cleverer than other animals	D．if some boxes were inside other boxes

After the scientist left the room, the monkey _______.

A．looked at the scientist through the keyhole	B．began to look for food
C．came into the boxes one after another	D．began to eat the food

To the scientist’s surprise, _____.

A．the monkey went out of the room

B．the monkey looked at the scientist through the window

C．began to look for food

D．put its eyes to the keyhole.