Martin is my youngest son. He likes staying alone and he seldom laughs. As the boy's mother, I was1 about him. I took him to see the2 in many hospitals, but it didn't work well.
Nothing could make him happy except the recycling truck（垃圾回收车）passing by my house. Every afternoon, he raced to the front of the house, waiting3 the truck.
When we were late and4 the truck, Martin would be very disappointed. One day, I stopped the truck and introduced5 .
"Nice to meet you, too. I'm Vince. " The driver greeted me in a happy6 .
"Your coming is the most exciting moment for my son. " I smiled.
After knowing our story, he said, " 7 you please give me your phone number? Maybe I can send you a message8 I arrive. "
Then began our friendship with Vince.
Recently, I said to him, "It's my little boy's birthday tomorrow. Can you do9 special for him? "
The next day, as I was standing by the driveway with Martin, we saw the10 truck running down the street with a loud beep（嘟嘟声）. Like a superman in a movie, Vince stopped and walked towards us with a box in his hand.
"Today is your birthday, Martin, and here's a gift. "
He handed the box to my son. Inside, there was a green model truck like his. My son, surprised, looked up11 and thanked him.
After chatting for several12 , he was about to leave for work. I tried to give him some13 for his help. He kept shaking his head and14 my money, saying, "Today you, tomorrow me. "
I was deeply moved（感动）by these15 words. And I have been ready to help others whenever I can. You will never know when you're going to be the one that needs help.
