Fill in the blank with a modal verb in its correct form.

1. He solved all five puzzles in less than five minutes! He [1] be very smart.  
a. would     b. wouldn’t          c. must     d. mustn’t

2. I refused to go near the water because I [2] swim. 
a. could      b. couldn’t          c. should      d. shouldn’t

3. I’m worried I [3] have offended her. I thought she looked annoyed, but I’m not sure.  
a. must      b. mustn’t          c. may      d. may not  

4. In an ideal world, he [4] have to worry about finances. But sadly, that’s not our reality. 
a. might      b. might not          c. would     d. wouldn’t

5. I told her she [5] make time to study for the exam. I knew she was busy at work, but we had a lot of material to cover.    

a. should     b. shouldn’t          c. can          d. can’t