69. Sometimes children are so young that they can’t tell the bad from the good. (保持句意基本不变)

Sometimes children are _________ young _________ tell the bad from the good.

68. I have always been busy because I have to do a lot of work. 　(对划线部分提问)

_________ _________ you always been busy?

67. We have fine weather today. 　(改为感叹句)

_________ _________ weather we have today!

66. Tom checked the mail every day during the summer holidays last year.　 (改为否定句)

Tom _________ _________ the mail every day during the summer holidays last year.

65. Jack has to look after her little brother at weekends. 　(改为一般疑问句)

__________ Jack __________ to look after her little brother at weekends?

64. The electric light is one of the greatest __________ in the world.　 (invent)

63. Work today is very __________ from the way it was fifty or even twenty years ago. 　(difference)

62. Listen to the teachers __________ in class and many of your problems will go away.　 (careful)

61. Body language is the __________ and most powerful language of all! 　(quiet)

60. It is really __________ to raise the dogs because they can help humans to hunt. 　(wonder)