1. Nelly's brother is clever but his sister is cleverer.

2. it's slower than a dog.

3. your dolls are nicer.

4. buy some better potatoes.

5. my sister is more beautiful.

6. the small grey monkey is funnier.

Ответ:

1)Cleverer

2)Slower

3)Nicer

4)Better

5)More beautiful

6)Funnier