Listen carefully or you won't catch what your teacher is saying.（保持句意基本不变）
_____ you _____listen carefully,you won't catch what your teacher is saying.
James spent ten years making this amazing film.(保持句意基本不变）
_____ _____ James ten years to make this amazing film.
Take a bus or you will miss the plane.（保持句意基本不变）
_____ you _____ take a bus,you will the plane.