3 Fill in the gaps with have to, don't have to.

Решение:

• 1. You have to go to the desert to see camels. You can see them at the zoo.
• 2. You have to work hard if you want to become a doctor. It is not easy.
• 3. You don't have to come with me. I'm the only one who knows how to get there.
• 4. We have to do something to protect the environment.
• 5. You don't have to give me a lift. I will walk.
• 6. You don't have to be washing up. Patty has done it already.