73. It took her three hours to finish her work. (该为同义句)

　　 She 　　　　　　three hours 　　　　　　her work.

72. It seems that he doesn't have many friends. (该为同义句)

　　 He　　　　　　 　　　　　　　to have many friends.

71. I think sixteen- year- olds should be allowed to drive. (改为否定句)

I __　　　　 　　　　　　sixteen -year- olds should be allowed to drive.

70. Please take the umbrella with you. Maybe it will be __________(help) to you.

69. Sometimes, however, he finds watching movies　　　 　　　(frustrate) because the people speak too quickly.

68. English is widely used in the world. Most people speak English as a____________(two) language.

67. I think young students should be allowed to make their own 　　　　　(decide).

66. Please don't feel ____________(worry) about your grandmother. She's well looked after.

65. In order to pass the exam he often 　　　　　　(熬夜) up.

(C)请你根据句意及所给单词提示，写出单词的正确形式。

64. She's a teacher of about 10 years'.　 __ (经验) of teaching. She can teach the students very well.