填空题 Directions: After reading the following passage, you should give brief answers to the 5 questions (No.1 to No.5) that follow. The answers (in no more than 3 words) should be written after the corresponding numbers on the Answer Sheet.. When you have a dog it is necessary to look after it very carefully. In return you will be loved by your dog. The most important part of dog-care is cleanliness. Not only does the dog have to be kept clean, but his environment should also be clean. The bed he sleeps in can be made with anything like a rug or a dog mattress. Proper feeding is also important to your dog's health. A dog should be fed in the same place and on a regular schedule. If your dog refuses to eat, don't force him. Remove his food and don't feed him again until his next regular feeding. Food should never be left before a dog more than thirty minutes. One important thing that many dog owners forget is exercise for the dog. Vigorous exercise helps build strength and keeps the dog healthy. A regular walk at fixed time of the day is enough to help a smaller dog live a healthier and happier life. Large dogs, though, require a run in an open field. If you observe the three points covered above, your dog will give you a great amount of pleasure小题:According to the author, what is the most important thing in dog-keeping? __________