Must: Modals of Obligation

By in Grammar on September 3, 2016

Please fill the blank with "must" or "must not" and the appropriate verb to make a meaningful sentence.

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1. You ____ (smoke) at gas station. That is dangerous!

2. Robert ____ (have) a lot of free time. He always goes out with his friends every night.

3. I ____ (buy) a new fridge. The one I have is not working.

4. We ____ (drive) above 100 kilometers per hour because that can cause an accident.