One day in early December，we woke up to discover a heavy fall of snow．"Mom，can we go
(1) after breakfast？"my eleven-year-old daughter Erica begged．I didn't want to
(2) her request，so we headed towards the only
(3) in our town．
When we arrived，the hill was crowded with people．We found an open spot next to a thin man and his three-year-old son．The boy was already ling in the sled （雪橇），
(4) to be launched．"Come on，Daddy!"he called．
The man looked over at me．"Okay if we go
(5) ？"he asked．
"Sure．Looks like your son is ready to go，"I said．With that，he gave the boy a huge
(6) ，and off he flew!And the father ran after his son at full speed．
"He must be afraid that his son is going to
(7) somebody，"I said to Erica．"We'd better be
(8) ，too．"
Then we also skied down the hill at a great speed．As we returned to the top，I noticed that the man was
(9) his son，who was still lying in the sled，back up to the summit（山顶）．When we reached the top，the boy was ready to play again．Again，the father
(10) him down the hill，and then pulled both the boy and the sled back up．The little boy was terribly spoilt by his father，I thought．
(11) he was small，the child could pull his own sled up the hill once in a while．This
(12) went on for more than an hour，but the man never
(13) ，and he was very happy instead．Finally，I could
(14) it no longer．I called to him，"You have tremendous
(15) !"
The man smiled and said，"He has cerebral palsy （脑瘫）．He can't walk．"
I was dumbstruck （惊呆的）．It had all seemed so happy，so
(16) ，that it never occurred to me that the child might be
(17) ．Although I didn't know the man's name，I told the
(18) in my newspaper column．Either he or someone he knew must have recognized him，
(19) shortly afterward，I received this letter：
Dear Mrs．Silverman，
The energy I expended on the hill that day is
(20) compared to what my son does every day．To me，he is a true hero．