Bill Fuller,a mailman,whistled cheerfully as he1up the hill towards Mrs. Carter'shouse. His work for the day was almost2,and his bag, usually quite heavy when he startedout on his rounds,was3now except for the letter that he had to deliver to Mrs. Carter. Shelived quite a few blocks away, so when Bill had mails for her,he usually finished his day's workmuch4. He was happy that Mrs. Carter often 5him coffee and a piece of her specialcake.When Bill got to Mrs. Carter's house, he was6that she did not work in the yard. She usually spent her afternoon there when the weather was7. Bill went around to the back of thehouse, 8 that she might be in the kitchen. The door was locked and the curtains were drawn.Puzzled,he returned to the front of the house and knocked loudly on the front door. There was no9. Bill thought that it was very strange because he knew that Mrs. Carter 10left thehouse. Just then he noticed that her bottle of milk, which is always delivered early in the morning,was still on the porch. This11him. If Mrs. Carter had not taken her milk, maybe she was12. Bill walked around the house13he found an open window. It was a14window, but he got through successfullyHe went into the hall. There he was almost stumbled(绊倒）over Mrs.Carter,who was15unconsciously at the foot of the stairs. Realizing that he needed help, he rushed out of thehouse,stopped a passing car and told the driver to go to the nearest telephone and call anambulance.