1．If you want to book tickets for the 2016 Olympic Games, just call 00952012. It ________ be simpler.
答案 couldn't
2．According to the school rules, no student ________ go out of the school after 23：00 sharp.
答案 shall
3．—I'm leaving now.
—It's so late. Better stay with me. Call a taxi if you ________.
答案 must
4．She was worried that we ________ get hurt.
答案 might
5．—I am really sorry to say that I ________ have shouted at you the other day.
—Forget it. I was a bit out of control myself too.
答案 shouldn't
