One day , Tom's teacher , Miss Mak, held a class meeting . " There will be a flag next Saturday. Does anyone want to join this meaningful event( 活动) ?" asked Mis Mak. Tom was interested in raising money for homeless children, but he was not brave enough to talk to the strangers , so he kept quiet in his seat " Tom , you haven't sold flags before , " said Misa Mak suddenly . " Would you like to have a try?"Tom was hesitant( 犹像的) ,but he finally nodded. On the flag day, Tom and Angrla sold flags in a busy stry , " Ex-cuse me . y-o-u pl-ea-se buy...?" said Angela softly to the first person she met. The mad smiled and put a five-dollar coin into Angela’s collection bag. Then she said thanks and put a flag under his shoulder. “I did it!” said Angela happily. “It’s your turn now.” Feeling nervous. Tom began to shake. Soon, he saw a young lady walking toward him. The lady was smiling and holding a few coins in her hand. She asked, " Are you selling flags for Fund for the Homeless Children ? " Tom's face became red and said y Then the lady made the donation( 捐赠) and Tom gave her a flag. "You made it!" laughed Angela. In the next couple of hours, Angela and Tom sold flags quickly and bravely. At their collection bags were so heavy that they had to hold them with arms. They felt very proud . Why did Tom keep quiet in his seat?