填空题

Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, and offer him (26) , some give protection, and some do hard work which man cannot do for himself. Dogs, which serve man in all three (27) , are found in various species in all countries of the world. The (28) of certain countries are dependent for their very lives on the camel. In the West Indies the little (29) , strong and sure-footed, carrying heavy loads even in mountainous places, is a familiar sight.
Trained and tamed for many (30) , domestic animals are not accustomed to roaming in search of food and shelter. They look to their masters to provide for their needs, and (31) these are supplied, they are content to do what their masters require.
All domestic animals need proper food. It must (32) them, sufficient in quantity, fresh and clean. The (33) of food depends on the size of the animal and the amount of exercise it takes. Overfeeding is as bad as underfeeding. Containers for food and water must be washed regularly if the animal is to maintain good health.
Even well-cared-for animals may sometimes fall ill. If this happens, the wise master seeks the best advice he can get. All sorts of medicines and (34) are available for sick animals, and in some countries (35) exist to provide them free or at a cheap price. Useful, friendly, hardworking animals deserve to have some time, money and attention spent on them.