Open the brackets, use the neccesary forms of adjectives

1. We should eat (healthy) food.
2. Today the streets aren’t as (clean) as they used to be.
3. It’s (bad) mistake he has ever made.
4.Which is the (beautiful) place in this part of the country?
5. This good-looking girl is the (good) student in our group.
6. There is a (great) number of cars and buses in the streets of Moscow than in any other city of Russia.
7. The rivers in America are much (big) than those in England.​