阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。 It was the day of the big cross-countryrun. Students from seven different primary schools in and around the small town were warming up and walking the route (路线) through thick evergreen forest.I looked around and finally spotted David, who was standing by himself off to the side by a fence. He was small for ten years old. His usual big toothysmile was absent today. I walked over and asked him why he wasnt with the other children. He hesitated and the
