A LAST B PREVIOUS C NEXT D TOMORROWĐỌC KĨ ĐOẠN VĂN RỒI CHỌN TỪ/...

70. A last B previous C next D tomorrowĐọc kĩ đoạn văn rồi chọn từ/ cụm từ thích hợp nhất trong số các gợi ý A,B,C, hoặc D để hoàn tất mỗitrong số các câu theo sau.There are thousands of types of animals on earth, but only few types are popular as pets. Peopleusually keeps pets for company. The most common pets are cats and dogs. But why did people choosethese two animals and not, for example, pigs, or chickens? The most likely explanation is that dogs and catshave special qualities which have always made them more suitable as animals companions. Some of thesequalities are easy to understand. For example, dogs and cats do not need to be kept in cages in order toremain close to their owners. They are also both very clean-living animals. They are active during the day,the same time that people are usually active. The physical size of dogs and cats is another important reasonfor their success as companions. They are a good size, since most cats and dogs are not so large that theyare dangerous, and not so small that they are unnoticeable. These qualities mean that dogs and cats can livequite comfortably with human. They do not disturb people's routines or change their way of life. But there isanother reason why these two animals are the most popular pets. Most people need to feel loved andwanted, and cats and dogs make people feel wanted. Cats and dogs need people as well. They show thisthrough the noises they make and they way they like being touched. To someone who doesn't like animals,keeping a pet probably seems like a lot of trouble. They need to be fed regularly and exercised, and they canbe noisy and expensive. But for pet owners, these disadvantages are not important, because of the friendshipthat pets offer. Clearly, cats and dogs will continue to be themost popular pets.