Exercise! Must vs Have to

1. All students in the third semester _______ declare a major.

2. You _____ keep my secret. 

3. I ______ go now. I have class in ten minutes. 

4. I ______ stop smoking. Smoking burns my money a lot. (must)

5. Tomorrow I will have my final exam, so I _____ study tonight.

6. The class trip to the art museum is a compulsory, so we _____ go. 

7. We _____ go to the concert. They say it will be an awesome concert this year. 

8. You ______ introduce me to Dr. Gray. He is such a kind-hearted person.

9. In order to be a good salesclerk, you ______ be polite to a customer.

10. This is an opportunity that comes once in a life time, so we _____ take it.