1)She is younger than his sister.
2)It's getting hotter and hotter outside.
3)I'm trying to do my work better.
4)Cars are becoming more and more expensive
5)This book is far more interesting than that one
6)Mike is taller than me.
7)I'm trying to be politer with new people.
8)It was easier to stay at home, than to go outside.
9)It is more interesting to read a book, than watch a film.
10)I've become cleverer since last year.
11) My grandmother is wiser than me.
12) The ocean is wider than river.
13)Today was colder than yesterday.
14)I tried to get higher, but i couldn't.
15)My hair are shorter than mother's.