nhanh giups minh voi a 1.If the homework is difficult, I will ask you for help. A.Unless the homework is easy, I will ask you for help. B.Unless the homework is difficult, I will ask you for help. C.Unless the homework is easy, I won’t ask you for help. D.Unless the homework isn’t difficult, I won’t ask you for help. 2. They ............... for America with nothing but the clothes on their backs. A. set off B. set in C. set to D. set up 3..From London to Oxford and back is a ............... trip of over a hundred miles. A. round B. return C. one way D. both A & B