We all know dogs are our good friends. They can_________us watch houses well._________only a few people know they are grateful (感恩的) animals. They will_________people in their ways if people help them.

A few months ago, Bill_________a dog named Dobeman out of a fire (火). He put the dog in a place far away from the fire. And then, he_________to put out (扑灭) the fire. After three hours, the fire was put out. Bill was too_________to walk to his house, so he_________and had a rest (休息) on the ground. At this time, Dobeman walked_________him. Bill looked at Dobeman and had no_________what it would do. Some minutes later, Dobeman came up to him, kissed his face and sat near him. Bill felt_________and kissed Dobeman, too.

The wolves (狼) are very hungry. They go out to look for food. There are many sheep near the hill. There are also a few sheepdogs with them. The wolves get an idea. They speak to the sheepdogs. “You are like us and we are brothers. But we have a very different life. We do what we like, but you must work for men. They make you look after their sheep. They eat meat and give you the bones(骨头). If you listen to us and give us the sheep, we can eat them together. All of us will be happy. Is that right?” The sheepdogs are happy and do like this. The wolves ask the sheepdogs to go to their house. The sheepdogs go to the wolves’ house. But the wolves eat them and then eat the sheep.

The polar bear is a very big white bear. We call it the polar bear because it lives in the Arctic near the North Pole. There are no polar bears at the South Pole.

The polar bear lives in the snow and ice. At the North Pole there is only snow and water. There is not any land. You cannot see the polar bear in the snow because its coat is white. It has a very warm coat because the weather is cold at the north of the Arctic.

The bear is three meters long, and it weighs 450 kilos. It can stand upon its back legs because it has very wide feet. It can use its front legs like arms. The polar bear can swim very well. It can swim 120 kilometers at a time in the water. It catches the fish and the sea animals for food. It goes into the sea when it feels afraid.

People like to kill the polar bear for its beautiful white coat. The governments of Canada, the US and Russia say that no one can kill polar bear snow. They do not want all of these beautiful animals to die.