阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。
I've dreamed of becoming a writer since I was a teenager. But ____isn't easy to get a book of mine published.____ I've tried hard, none of my books have been published. This is really ____(upset).
This morning, I received a call from a publisher and ____(tell) once again that there was no way my book would be published.____ ( feel ) sad, I left home and went to the park near my apartment. At the park, I sat down on the bench near the grass.
While I was sitting there, I saw a little boy about one and a half years old. He was running on the grass,____ his mother not far behind him. He looked so happy when he enjoyed the ____(free) of running on the grass. He then fell on the grass, but he quickly got up and continued ____(run) as fast as he could again even without looking back at his mother. He was still running with a smile on his face, as if nothing ____(happen).
Seeing that, I was truly inspired. I ____(sudden) realized that I shouldn't get discouraged after experiencing failure. Instead, I should cheer up and keep on trying.
