We need oxygen in air to maintain our lives.Moreover,oxygen facilitates burning.If there is no oxygen,a fire goes out.Fires can be put out using this principle.

We need oxygen in air to maintain our lives.Moreover,oxygen facilitates burning.If there is no oxygen,a fire goes out.Fires can be put out using this principle. We need water to drink and oxygen to ------------?A.survive B.breathe we need in We ____ in oxygen in the airA.breath B.breathing C.breathe D.breathed要理由 we are both in need of happiness We are in need of gas. 同义句转换 we have sweaters in all colors.we have sweaters in ( )color.we have sweaters in all colors.we have sweaters in ( )color.i'm just a studentsi'm ( )a studentsi buy it ai a good price i buy it ( )i need to have looki ( )to ( )请你给 In means green ,oxygen ,light and foot. 求We have all we need in hands中文意思 When we breathe,the oxygen in the air（） with our blood and gives us life.A、fills B、goes C、takes in D、mixes we need Is there life on Mars(火星)?We do not know.We are sure that earth people like us cannot live on Mars.Earth people need oxygen（氧气）to breathe(呼吸),but there is almost no oxygen on Mars. Living on Mars is like living on a very high mountain As is known,the oxygen we breathe in mixes with our blood and gives us life这句话怎么翻译啊 we should help the people in need 对in need提问 These plants will produce food and oxygen that we need.Scientists should be able to develop plants that grow on Mars.这两句什么从句?能不能帮忙分析各种句型?我分析各种从句能力太差了. that引导从句的功能和that代指东西的功能搞混了教科书上These plants will produce food and oxygen that we need to live on Mars1.这句中的that不该改成those吗,因为those才可以代指food and oxygen ,为什么不可以换呢 Sometimes struggles are exactly what we need in our life. we need to buy a big h( ) to live in