.Complete the sentences with the correct form of the adjective.
1. Which river is________________ (long) than the Amazon? 2. Which river is____________________ (long) in the world? 3. Who is_______ (good) student in your group? 4. Mary is as ____________ (tall) as Ann. 5. Sarah is three years__________ (old) than Ellie. 6. The African Black Mamba is one of____________________________ (poisonous) snakes in the world. 7. Children are often ______________ (noisy).​