68.　 We handed in all the test papers before the bell. (改为被动语态)

All the test papers _____ ______ in before the bell.

67. We visit our grandparents once a month.( 对划线部分提问 )

_______ _______ do you visit your grandparents?

66. It took Thomas Edison a long time to make the first light bulb(灯泡). (保持原句意思)

Thomas Edison _____ a long time ______ the first light bulb.

65. Tim often does some walking after supper.(改为一般疑问句)

　_____ Tim often _____any walking after supper?　

64. During the Expo, the World Expo Center will be the news center, meeting center and forum(论坛)_______ center.(active)

63. The string of the kite suddenly broke and the kite ___________. (appear)

62. If you drink too much, your health will get even ___________(bad)

61. “You miss your father, don’t you?” the mother asked ________. (gentle)

60. Lin Zexu is one of our country’s national ___________.(hero)　

59. The restaurant _______ Sushi and other Japanese food.(service)