1 . 我的姐姐回家时满脸笑容。她一定通过驾照考试了。(情态动词 + have done)
My sister came home with a broad smile on her face. She ____________________________.

2 . 你很熟悉这个城市，你一定在这里待了很长时间。(must)
You are very familiar with the city; you ________ here for a long time.

3 . You_______________(一定有过一些时刻) when you were disappointed. （“must have done sth ”意为“一定做过某事”）

4 . Tom didn’t respond to any of my calls. Something ____________________________ to him.  
汤姆没接我的电话。他一定是出什么事了。

5 . 他肯定是受到了惩罚，因为他今天不高兴。
He __________________for he is upset today .

6 . 我们一定是走错路了，因为道路变窄了。(must have done)
________, because the road became narrow.

7 . 既然没有人帮助他, 他一定是独自完成了这项研究。(must have done)
Since nobody gave him any help, he ________.

8 . 我相信他肯定遇到意外事件了，否则他会按时到的。(must have done)
I believe ______; otherwise he would have arrived on time.

9 . 汤姆昨晚一定熬夜到很晚。他是那么困以至于刚才我们在一起唱歌的时候他睡着了。
Tom________ last night. He was________ he fell asleep when we sang a song together just now. (must)

10 . 他们一定去过长城，不是吗？
They ________ to the Great Wall, haven't they?