阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。How much do you know about bear? Do bears attack people? The answer is certainly positive. So people in a small city in Colorado were concerned. Why? Last week, a large black bear attacked a family's coop and ate the chickens. It was reported by a local TV station. At the end of the news report, a policeman asked local residents to keep waste, pet food and even birdseed inside, and to report any bear sightings until the animal was found. The policeman also told people to always stay away from the bear when they saw it.
Sam is a 12-year-old boy. Earlier this week, he came to that small city to visit his uncle's family with his mother. His uncle's son, David, was very excited about the bear that had appeared in his neighbor's backyard.
“Sam, there is a bear in our city,” soon after Sam arrived, David told him.
Sam was curious about bears and he had always dreamed of watching one.
“Really?” he asked excitedly.
“Yes. It went into Mrs Brown's backyard last week. It ate all her chickens. But it had run away and I didn't even see it,” said David.
Sam listened with his eyes wide open. “Would it return?” he asked.
“Very probably,” said David, “it would return for food.” At last, he asked Sam.
“Do you want to see the bear?”
Sam immediately nodded. Then he asked, “But how?”
“We can put some food in the backyard. When the bear sees it, he will come in and eat it. But we should be careful. The bear may attack us if he sees us. So we should never make any noise.”
Sam nodded again, still in excitement.
Later that day, the adults all went out, leaving the two boys alone at home. Soon they started to take action.
They put some leftovers from lunch in the backyard. Then they waited behind the window of the kitchen and waited curiously. But an hour passed and they didn’t see a bear. Finally, they got bored.
注意：
1．所续写短文的词数应为 150 左右；
2．续写部分分为两段，每段的开头语已为你写好。
Paragraph 1：Just then, they saw something big at the gate of the backyard.
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Paragraph 2：When the bear looked up, he saw Sam.
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