If left alone outside, dogs and cats can be very smart in their search for warm shelter. They can dig into snow banks or hide somewhere. Watch them closely when they are left outdoors, and provide them with shelter of good quality. Keep an eye on your pet’s water. Sometimes owners don’t realize that a water bowl has frozen and their pet can’t get anything to drink. Animals that don’t have clean and unfrozen water may drink dirty water outside, which may contain something unhealthy for them.

　　28. What do we learn about pets from Paragraph 1?

　　A. They are often forgotten by their owners.

　　B. They are used to living outdoors.

　　C. They build their own shelter.

　　D. They like to stay in warm places.

　　29. Why are pet owners asked to stay with their pets when they are out in cold weather?

　　A. To know when to bring them inside.

　　B. To keep them from eating bad food.

　　C. To help them find shelters.

　　D. To keep them company.

　　30. If pets are left on their own outdoors in cold weather, they may ___.

　　A. run short of clean water B. dig deep holes for fun

　　C. dirty the snow nearby D. get lost in the wild

　　31. What is the purpose of this text?

　　A. To solve a problem. B. To give practical advice.

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