题目内容：

    It was a cold December day． After saying goodbye to his neighbor， David， Tom set out for a run with his dog， Taz．As a professional athlete， Tom often went for training runs by himself， and had done this particular route many times before， but that day something unusual happened to him．

About an hour later， Tom hit some black ice． He found himself slipping down the rock face， which became steeper and steeper （陡峭的）until suddenly he was in free fall． He fell 60 feet into the canyon （峡谷），landing on grass and dry branches． If he'd missed them， there was no way he would have survived． He could feel his legs，so he knew he wasn't paralyzed （瘫痪的），but he was in great pain． Taz had managed to find his way back to Tom， so Tom knew there must be a way out of the canyon， but he couldn't stand or even crawl （爬行）． He later learned that he had broken his pelvis （骨盆）．

Tom shouted for help， and tried to pull himself forward． Every inch was an effort． It took him five hours to go a quarter of a mile． Eventually it got so dark that he couldn't see where he was going． He decided to stay next to a river which he could drink some water from． All he had on him were his jogging clothes， a water bottle， two boxes of medicine， a bar of chocolate， and a shower cap which adventure racers often wear to prevent heat loss．

At night， the temperature dropped below freezing． Tom couldn't go to sleep or he would die， so he stayed awake lifting his head a few inches，over and over． Throughout the night，Taz curled up next to him and kept him company． The next morning， he couldn't move any more． He tried to stay positive． He was sure somebody would find he was missing or hear him screaming for help． But there was nobody around．

注意：

1．所续写短文的词数应为150左右；

2．应使用5个以上短文中标有下划线的关键词语；

3．续写部分分为两段，每段的开头语已为你写好；

4．续写完成后，请用下划线标出你所使用的关键词语．

Paragraph 1：

As time went by， Tom felt himself growing weaker and he knew he must take action，

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Paragraph 2：

About three hours later， Taz returned and Tom heard an engine in the distance．

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