Frank was a teenager living with his father. He had so many family rules ______ he couldn't stand，so he left home. Because he couldn't find a job，he had to make a ______ by begging.

Years later，his father was old，but he was still ______ for his son. He had been to every corner of the city. ______ he went，he put up a big photo of himself and Frank on the wall. At the lower part of the photo，he ______，“I still love you. my dearest son. Please come back home！”

One day，Frank saw one of the photos. The faces on the photo were familiar to him. “Is that my father？” he thought for a while and ______ to go back to see his father.

It was an early morning ______ he got home. The door was not locked. He rushed to his father's bedroom. “It's me！Your son is back home！” The father and the son held each other，full of happy tears（眼泪）in their ______.The son asked，“______ is the door unlocked？A thief could get in.” The father answered in a soft _______，“Because I'm expecting your return. In fact，the door has never been locked since you left.”