Animals perform. many useful entertaining jobs. Dogs are particularlyvaluable in guiding t

Animals perform. many useful entertaining jobs. Dogs are particularly

valuable in guiding the blind, protecting property, finding losing 【M1】 ______

people, and hunting criminals. Horses are used in guarding herds, carrying

men in lands that there are no roads, and helping farmers work their 【M2】 ______

land. Pigeons have long used to carry messages. Wild animals from the 【M3】 ______

jungles, forests and seas are very popular performers in circuses and moving

pictures. People realized that, although animals may not have same 【M4】 ______

intelligence as human beings, they are enough smart to learn certain things. 【M5】 ______

The first thing a dog taught is to obey. It should not take too long for 【M6】 ______

him to learn commands. Simple orders, such as "sit, lie down, stay there,

come here," can even be taught by a child.

Training a dog to be a watchdog often produces unexpected results.

Soma dogs quickly learn the differences between unwanted people from 【M7】 ______

friends. This is because their masters welcome friends and invites them

into their house. However, some dogs will always attack the postman who

goes to deliver letters. One explanation for this behaviour is that, 【M8】 ______

the postman comes to the house often, he never enters the house. Therefore, 【M9】 ______

the dog thinks the postman is someone who is not wanted,

but keeps to come back anyway. 【M10】 ______

【M1】