Instructions: Choose the best modal auxiliary.
1. You are sick. You ____________ stay home.
a. should b. might c. ought
2. Dan is not in class. He ____________ be sick.
a. prefers b. had to c. must
3. You _____________ buy food. We have enough at home.
a. do not have to b. must c. should
4. I am not sure where Andrea is. She ____________ be in the restroom.
a. might b. should c. have to
5. My neighbors were making a lot of noise, so I ______________ sleep last night.
a. could not b. cannot c. should not
6. I have insomnia. I ____________ sleep every night.
a. could not b. cannot c. should not
7. I left my cellphone at home. ___________ I please borrow your cellphone?
a. Should b. Must c. May
8. I am not strong enough to lift this table. _______ you please help me?
a. Could b. May c. Ought
9. You ____________ finish your lab hours, or you will get a grade of "Incomplete."
a. have better b. had better c. don't have to
10. You _____________ dance on the furniture! This is not your house!
a. ought to b. should c. must not
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