One afternoon, when the lessons were over, John and Mike Green didn’t go home. T

One afternoon, when the lessons were over, John and Mike Green didn’t go home. They (11) stayed in school to help their teacher. Their teacher was (12) starting a library in the school and the boys helped him to carry some books. They worked (13) for an hour. Then the teacher said, "Thank you, boys, we will (14) finish the work to morrow. Now you must go home." When the boys got home, it was seven o’clock. It was (15) dark outside but there was a light inside their home and the door was open. They could see a man inside.