Прочитайте текст и заполните пропуски подходящими по смыслу словами
The digestive 1_______ consists of the mouth, the gullet, the stomach, the small intestine, and the large intestine. The mucous membrane of the 2_______ tract has glands in it. They secrete digestive fluids. 3_______ and sheep have much more complicated digestive tracts than other animals. Their 4_______ consist of four compartments. The horse, the pig and some other animals have a simple stomach. It consists of only one compartment.