Study the following grammar explanation

For each sentence below, choose the correct word from the box and use the correct modal form to fill in the blanks. 

Example: You have an exam, you __________ hard.

You have an exam, you should study hard. 

1. He ________ ______ more in a month. 

2. It ____________  _____ for a mechanic to fix a car. 

3. The Uber  _______  _____ _____ here five minutes ago.

4. She ______ _____    the amount of change she gave me.

5. We _____  _____ ____  a refund for the lousy movie.

6. You ______ _______ his poor behavior.

7. They _______  ________ so much candy.

8. I _________ have helped, so now I should hire someone.

9. You really _______  _____ her the whole story. 

10.  They _______ not ______ to change the time.

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