【正文】
___ _________ to help her classmates. Key: Unit 1 Ⅰ . 1. prevent 2. suppose 3. debate / discussion 4. illness 5. medicine Ⅱ . 1. pollution 2. worse 3. healthier 4. difference 5. relaxed Ⅲ . 1. does better in 2. Why not ask 3. the same。 as 4. worse than 5. less free time Ⅳ . 1. What do you think 2. Are。 finish ed 3. go on a trip 4. Talking of 5. does her best