Giúp em vs mn ơi,mai em nộp r Câu1: Hurry up or we will be late for the concert --) If we..................................... --) Unless we.................... Câu2: Our sources of energy will soon end if we don't try to save them --) Unless............................................. Câu3: Lan'll catch cold if she doesn't keep her foet dry --) Unless...................................... Câu4: Because he doesn't pay attention to the teachers,he doesn't understand the lesson --) It................................................... Câu5: You needn't summit the essay today (It) --) ............................................................ em cảm ơn ạ