Translate the sentences.
1. Miss Chatter is _(выше) than Mary.
2 Tim is _(умнее) than Tom.
3. In the country rivers are _(чище) than in the city.
4. Moscow isn't the_ (самый большой) city.
5. He is the_ (лучший) teacher in my school.
6. It is the_ (самый холодный) day today.
7 John is a _(хуже) singer than me.