Many years ago, people use a stick, a large piece of wood and dry leaves to make a fire. Today, wood, gas (煤气) and electricity (电) can all make a fire. I think wood is the most dangerous. And I like gas most because it's easy.
People use fire in many ways. At home, people use fire to cook food and boil water. In factories, workers use fire to melt (熔化) metals (金属) to makes things of different shapes. Some workers use fire to make glass.
Fire can help us to do many things, but sometimes fire is dangerous. Cigarettes and campfires can all start a fire in the countryside, in schools and at homes. We must be careful. We mustn't smoke in the countryside, and we mustn't cook without an adult (成年人). We mustn't play with matches. We mustn't play around a fire.
—It (come) from a cigarette end.
⑴must not(缩写形式)
⑵drop(现在分词)
⑶brave(副词)
⑷slowly(反义词)
⑸dies(动词原形)
⑹match(复数)
⑺soft(副词)
⑻smoke(现在分词)
⑴start past
⑵smoke blow
⑶near there
⑷must put
⑴What must we do before lunch? A. We mustn't smoke.
⑵What mustn't we do in the forest? B. No, you needn't.
⑶Must I finish the work now? C. No, you can't.
⑷What do you need for making tea? D. Some boiled water and tea.
⑸Can I throw the stone in the river? E. We must wash hands.
—Wear warm clothes.