2017年外研版必修三Module6 Period 2课时提升作业含解析 Ⅰ. 用所给词的适当形式填空 1. Burning coal has led to __________ (globe)warming. 2. They will do their best to __________ (generation)more energy from the wind and sun. 3. The 20-kilometre-long subway is so far this city’s largest __________ (construct)project. 4. Mr Smith, a history teacher, is busy doing some __________ (history)research. 5. The gap between the two parties has been __________ (narrow). 6. When he was at university, he majored in __________ (engine).