Ⅱ.用方框内所给短语的适当形式填空。-|||-be likely to,be supposed to,would rather, had better,be able to,have got to,used to,be about to,-|||-be to __-|||-1.It looks as if it is going to rain,so you __ take an umbrella.-|||-2. I __ go out when I had an unexpected visitor.-|||-3. -smolingorice, that is to say,people __ smoke in the office.-|||-4.It`s only 4:00 p.m.now,so your father __ return home.-|||-5.He __ go back to Bergen on the last bus,but of course the accident prevented him.-|||-6.He __ go swimming once a week,but now he is too busy to make it.-|||-7.The fire in the hotel spread quickly,but everyone __ escape it.-|||-8. I __ clean the blackboard before the teacher comes.-|||-9. I walk than take a bus.

本题考查情态动词短语的用法，需根据语境选择合适短语并调整形式。解题核心在于：

1. 理解句意，明确动作的时间、语气、逻辑关系；
2. 区分短语核心含义：
   • be likely to：可能性；
   • be supposed to：义务/预期；
   • would rather：宁愿；
   • had better：建议；
   • be able to：能力（成功完成动作）；
   • have got to：必须；
   • used to：过去习惯；
   • be about to：即将做某事；
   • be to：规定/安排。

1. It looks as if it is going to rain, so you __ take an umbrella

句意：看起来要下雨，所以你最好带伞。
关键：建议对方采取行动，用had better。

2. I __ go out when I had an unexpected visitor

句意：我正要出门，这时来了个不速之客。
关键：表示“正要做某事被中断”，用was about to。

3. This is a non-smoking area, that is to say, people __ smoke in the office

句意：这是无烟区，也就是说，人们不能在办公室抽烟。
关键：表示“规定不能做”，用are not to。

4. It's only 4:00 p.m. now, so your father __ return home

句意：现在才下午4点，你父亲不可能回家。
关键：表示“可能性低”，用is not likely to。

5. He __ go back to Bergen on the last bus, but of course the accident prevented him

句意：他本该坐末班车回伯根，但事故阻止了他。
关键：表示“原本应该做但未做”，用was supposed to。

6. He __ go swimming once a week, but now he is too busy to make it

句意：他过去每周去游泳一次，但现在太忙了。
关键：表示“过去习惯”，用used to。

7. The fire in the hotel spread quickly, but everyone __ escape it

句意：酒店火势蔓延很快，但所有人都逃出来了。
关键：强调“成功完成动作”，用was able to。

8. I __ clean the blackboard before the teacher comes

句意：我必须在老师来前擦黑板。
关键：表示“必须做”，用have got to。

9. I walk than take a bus

句意：我宁愿走路也不坐公交。
关键：表示“宁愿”，用would rather。