题目内容：

Ann stepped outside her front door to see1.the weather was like. It was still cold and2. (rain). It had been so cold that she had had to turn her heater on. She was lucky because her heart worked and she could pay her  3.(heat)bills.

Some people in Los Angeles weren’t so lucky.4.(able)to use their home heater, the placed charcoal into a barbecue grill and lit it. The heat kept them warm, but the carbon monoxide killed them.

This happens almost every winter in Los Angeles. People shut all the windows tight5.(keep)the cold out, then light the charcoal. Soon enough, the oxygen in their home 6.(consume)by the open flames. The family choke to death. Everyone knows smoke detectors(检测器)are required in Los Angeles. 7.many people don’t know about, or don’t think they need carbon monoxide detectors. They’re not expensive. A $25 investment can save a family from death.

People always think that nothing bad will happen to them; it always happens to “8.other guy”. So they forget to put several fresh 9.(battery) into their smoke detectors10.(annual), and they don’t bother to buy carbon monoxide detectors.