convincing reminding rewarding
Our teacher gave us a task called "secret friends" for the coming week.We were supposed to do nice things  for  our friends without letting them know who was doing it.We could leave  [MASK]  notes or cards either on their desks or in their backpacks.Before doing the task, with our eyes closed, from a basket, we  drew  a name of a classmate who we were to secretly befriend over the next five days.