`Anwer:` 

`54.` The yellow hat is cheaper than the blue one

`55.` The pink dress is more expensive than the red one

`56.` Nam is the tallest in my class

`57.` Phong and my brother are the same height

`58.` Reading comics is more boring than watching cartoons

`59.` Meeting friends is more interesting than playing chess

`60.` My desk is newer than that one

`61.` That test is more difficult than this one

`62.` The red car is more expensive than the black one

`63.` Is this the cheapest computer?

`64.` Trung is the tallest in the group

`65.` Is this the better refregerator?

`66.` No one house in the street is older than mine

`67.` Your house is bigger than mine

`68.` The exam wasn't as difficult as we had thought before

`------------------`

`-` Giải thích

`@` Cấu trúc so sánh hơn :

`+` Đối với tính từ ngắn : S + tobe + adj_er + than + S

`+` Đối với tính từ dài : S + tobe + more + adj + than + S

`@` Cấu trúc so sánh nhất :

`+` Đối với tính từ ngắn : S + tobe + the + adj_est + N

`+` Đối với tính từ dài : S + tobe + the + most + adj + N

`color{brown}{Rosie256}`