40. Had they studied hard, they _________________ .(.现在做它就会容易了) ( do )

39. When Edison died, it was suggested that the American people _________________________ (关掉所有电源) in their homes, streets and factories for several minutes in honor of this great man.　 (turn)

38. ____________________________________ (把一种癌症看作一个礼物) requires extreme courage.　 (think)

37. ____________________________ (比起他曾经拥有的), the stamps were not interesting at all. ( compare)

36. ____________________________________ (违法的人) should be punished.　　 (break)

35. How I wish I _______________________ (没有动过) about that recorder! I just made it worse.　 (do)