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.