Study the following grammar explanation.

For each question below; Complete the sentence by choosing a word from the box and use the correct modal grammar form. 

Example: You have an exam, you __________ hard.

You have an exam, you should study hard. 

1. You look very tired, you __________ so hard.

2. If we study hard, we ___________ the test.  

3. People ____________ cars because it produces more pollution. 

4. People __________ winter coats when it is cold. 

5. Students ___________ up late the day before an exam.  

6. I don't think food ____________ so expensive. 

7. I think you ____________ for permanent residence soon. 

8. I think the exam ____________ so long to complete.

9. People ___________ too much sugar because it's not good for their health. 

10. The students ___________ their teacher's instructors. 

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