1. 除非你很早起床，要不你赶不上早班汽车。
    _______ you get up early, you _______ the early bus.
2. 昨晚他在看电视时，我正在发电子邮件给我的笔友。
    I _______ to my pen friend _______ last night.
3. 吉姆别无选择，只能把所有努力倾注于工作之中。
   Jim has _______ but _______ the work.
4. 我不能确信他能和所有的同学相处得很好。
    I_______ he can _______ all his classmates .
5. 当他们到达电影院时，电影已经开始五分钟了。
    When they _______ the cinema, the film _______ for five minutes.

1. 昨天他不得不早起床赶公共汽车。    
He          get up early to catch the bus yesterday.  
2. 现在我必须做作业。
I          do my homework now.
3. I had to get up early yesterday.(改为否定句)
I               to get up early yesterday.  
4. She has to clean the room every day. (改为否定句)
She               to clean the room every day.  
5. I can dance and sing. (改为否定句)
I        dance        sing.  
6. The students can eat in the hallway.(改为一般疑问句)    
       the students        in the hallway？