Jack is a twenty-year-old young man．Two years ago，when he finished middle school，he found work in a shop．Usually he works until ten o’clock in the evening．He is very tired when he gets home．After a quick supper he goes to bed and soon falls asleep．His grandma who lives downstairs is satisfied with him．
One day，on his way home，he met Mary．They were both happy．He asked the girl to his house，she agreed happily．He bought some fruit and drinks for her．And they talked about their school，teachers， and their future．They talked for a long time．
“Have a look at your watch，please，”said the girl．“What time is now?”
“Sorry，something is wrong with my watch，”said Jack．“Where’s yours?”
“I left it at home．”
Jack thought for a moment and found a way．He began to stamp his foot on the floor，“bang！bang！bang！”
The sound woke his grandma up．The old woman shouted downstairs，“It’s twelve o’clock in the night，Jack．Why are you still jumping upstairs?”
Jack was      when he finished middle school．
A．sixteen         B．eighteen        C．twenty    
The old woman is satisfied with Jack because     ．
A．he’s her grandson             B．he can keep quiet
C．he gets up early
From the story，we can know that Mary is Jack’s     ．
A．classmate      B．colleague        C．aunt
The underlined word“stamp”in the story means      in Chinese．
A．盖印          B．跺             C．贴邮票
Jack stamped his foot on the floor in order(为了)     ．
A．to make his grandma angry
B．that his grandma was going to tell him the time
C．that his grandma was going to buy him a watch