The Vietnam War broke out. The young husband 1 the army and died in the war .His wife and son began to have a 2 after that. Although their life was very hard and sometimes they didn't have enough food to eat, the 3 still decided to raise her son by herself. Several years later her son immigranted to America 4 finally became an engineer. He often sent letters to his mothert with much money. However, with many excuses, the son 5 to come back home to visit his mother. 6 his mother died, the son returned. But he didn't cry. His mother left a box behind. During the funeral, the son opened the box and 7 cried and shouted, "Mom! Mom!" 8 ooked at each other and then looked at the box. It was full of $100 bills and a piece of paper. It read, "son, I don't spend too much money. I miss you a lot. Every time I heard a motorcycle 9 , I ran out of the door but it wasn't you . I saved money 10 you in case you get sick.