Write the correct comparative.
1. A: This top is too big for me. I need a ........... (small) one.
B: I'm sorry, this is the ................. (small) size we have
2. Tom is always smiling. He is the ............... (friendly) person is know.
3. This book is .............. (difficult) than the oe we did last year.
4. When the traffic is heavy, it is .................. (easy) to walk to work than drive my car.