1 . 选用适当的单词或短语补全对话
Boss: All the documents     1     （must/can） be prepared before the meeting starts
Secretary: I know that. Kelly has been working on the documents since last Monday. She     2    （may/must）have got everything ready but I am not sure.
Boss: Wheres Kelly then?
Secretary: She     3     （must/has to）be in the sales managers office now. I saw her go in there a minute ago.

2 . 选用适当的单词或短语补全对话

may/must/ should/can/ be able to/have to

June: Excuse me,     1     I use your computer for a while?
Melissa: Yes, you     2    . But it is not connected to the Internet, so if you want to check your e-mail, you won’t     3    
June: Then I’ll     4     find another one, but thank you anyway.