Ответ:
1. Her eyes are greyer than mine.
2. He was the fattest man in the village.
3. My sister is the tallest girl in her class.
4. This is the most beautiful view I have ever seen in my life.
5. Your handwriting is now better than it was last year; but still is not so good as Nick's handwriting.
6. Nellie has the best handwriting of all.
7. Oil is lighter than water.
8. A bus is faster than a tram.
9. The tallest trees in the world grow in California.
10. Today the streets aren't as clean as they used to be.