阅读短文,根据其内容回答问题.

阅读短文,根据其内容回答问题.
What's the most important thing you've ever done in your
life?For me,it was the occasion (a time when something happens),a few weeks
ago,when I was able to save someone's life by being in the right place at the
right time.
I was at the public swimming pool,and I was going to get
dressed and go home.Because it was a cool,cloudy afternoon and beginning to
get quite late,the pool was almost empty.The life guard was nowhere to be
seen,and the only other swimmer was an eight-year-old girl.
As I got out of
the pool and began to dry myself,the girl dived into the water again.After
thirty seconds or more she still didn't come to the surface,so I began to
worry.I ran to the deep end of the pool,where I saw her struggling (挣扎) wildly
underwater.I dived in to help her,and found that her long dark hair was caught
in the drain （排水管）at the bottom of the pool.I tried to help her get free,but
failed ---and,of course,she was dying from being under water for too long.
I swam to the surface and shouted for help,but there was no one there.Then
I noticed an empty Coke bottle on a table near the pool.So I climbed out,
smashed (to break) the bottle and dived back into the water with a piece of the
broken glass.Using the sharp edges of the glass,I was able to cut through the
girl's hair and set her free.I managed to get her to the surface.She coughed
out lots of water before she finally began to breathe normally again.
Then
the life guard arrived on the scene and checked that the girl was all right and
called her parents.When they heard what had happened,they kept thanking me for
saving their daughter's life.I was relieved (松了一口气) that she was OK,and I felt
very proud of myself.After all,wouldn't you have felt the same if you'd been
in my place?
17.Were there many people at the public swimming pool at that
time?
18.What happened to the girl?
19.Was the phone call to the
girl's parents made by the life guard or the writer?
20.How did the writer
save the girl?
21.What does the writer think of "saving the girl"?
好的追分~

17.There was not many people in the pool at that time.
18.The girl is drowning.
19.By the life guard
20.He cut the girl's hair with the a piece of the broken glass
21.He felt very proud of himself