若矩形ABCD的对称中心恰为原点O，且点B坐标为（-2，-3），则点D坐标为__

     As sixth graders, kids were separating into groups, but I wasn't sure where I belonged.
     Our teacher gave us a task called "secret friends" for the coming week.We were supposed to do nice
things   1   our friends without letting them know who was doing it.We could leave   2   notes or cards
either on their desks or in their backpacks. Before doing the task, with our eyes closed, from a basket, we
   3   a name of a classmate who we were to secretly befriened over the next five days.
     Soon, the task was turned into a competition of giving   4   instead of notes.Everyone was getting cool
presents except me.My friend followed the teacher's   5   without a fault.I received nothing but handmade
cards with nice words about me.
     On the last morning, I finally got a package.When I   6   it, the girls around all  7  .It was perfumed
powder, an"old lady" gift.My face went red.
     I tried to forget about the   8   gift, but when the same girls   9   it again during the break in the bathroom,
I joined in,"How stupid! My grandmother wouldn't  10  want it." The girls laughed at my  11  and left the
bathroom.Washing my hands, I let the water run through my fingers   12   I thought about my words. It
wasn't  13  like me to say things like that.
     "I'm your secret friend." It was Rochelle. "I' m sorry about the gift," she whispered to me, tears  14  down
her face.
     From a poor family, she was a  15  at school for those with rich parents.Yet she just took all the  16   and
the horrible treatment silently.
     I was sick to my stomach as my  17  words ran through my mind.She had heard everything.How could I
have been so cruel?
     Later I learned she had felt bad all week about not being able to leave me any cool present and her mum
had given up her only luxury (奢侈品). 
     And I had  18  everything for her.
     I told her that I had only said those things to try to   19  .
     "We aren't that different from each other, are we?" She smiled    20  .Her simple words, spoken from her
heart, found their way straight into mine.