18. D。。19. A。 ，。within oneself，。20. C。 beautiful保持一致。

　　.短文改错

　　I've a friend who has a big police dog is named Jack.

　　1._________________

　　Every Sunday afternoon my friend takes Jack a long walk in

　　2.__________________

　　the park. Jack likes these walks in the park very well.

　　3.______________________

　　One Sunday a young man dropped in my friend. He stayed

　　4.____________________

　　去掉is

　　Jack∧→for

　　well→much

　　in∧→on

　　a long time. He talked and talked. Soon it was the time for my

　　5.____________________

　　friend to take Jack for his walk, but the visitor still sat talking.

　　6.______________________

　　Jack became worried his walk in the park. He walked

　　7._____________________

　　around the room several times but then he sat right in

　　8.__________________

　　He→They

　　√

　　worried∧→about

　　but→and

　　front of the visitor and looked him. But the visitor paid

　　9._________________

　　none attention. He continued talking. Finally Jack could

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