1. This pen is better than that pen.
2. An old bike is worse than a new bike.
3. This book is more beautiful than that one.
4. Lan is more intelligent than Hoa./ Lan is less intelligent than Hoa.
5. A mouse runs more slowly than A cat.
6. I swim more slowly than he does.
7. This car is better than that car.
8. A red pen is worse than a blue pen.
9. Tom is happier than he is.
10. They are shorter than she is.