Помогите пожалуйста Ex:4 help me plz

2. The cheetah is the fastest animal in the world.

3. The Mona Lisa is the most famous painting in the world.

4. The University of Al-Karaouine in Morocco is the oldest university in the world.

5. The Himalayas is the highest mountains in the world.

6. The Australian box jellyfish is the most poisonous creature in the world.