Mustn't X Don't Have To

You _____ apologise; it isn't necessary.

• mustn't

• don't have to

You _____ tell the boss what happened, or he'll fire you.

• mustn't

• don't have to

I _____ wear a tie; I do it because I like wearing ties.

• mustn't

• don't have to

You _____ smoke in here. Smoking is not allowed.

• mustn't

• don't have to

I _____ be late. It's the most important meeting of the year.

• mustn't

• don't have to

You _____ go now; you can stay a bit longer.

• mustn't

• don't have to

Visitors to the zoo _____ feed the animals.

• mustn't

• don't have to

You _____ drive so fast. We have a lot of time.

• mustn't

• don't have to

We _____ cook more; there's enough food.

• mustn't

• don't have to

We _____ put salt in her food.

The doctor said she can't eat salt.

• mustn't

• don't have to