$\textrm{1.Lan is taller than Hoa.}$

$\textrm{2.This book is thicker than that book.}$

$\textrm{3.The chair is shorter than the table.}$

$\textrm{4.These boxes are bigger than those boxes.}$

$\textrm{5.Miss Trang is younger than her sister.}$

$\textrm{6.These buildings are higher than those buildings.}$

$\textrm{7. The boys are stronger than the girls.}$

1, Lan is taller than Hoa.

2, This book is thicker than that book.

3, The chair is shorter than the table.

4, These boxes are bigger than those boxes.

5, Miss Trang is younger than her sister.

6, These buildings are higher than those buildings.

7, The boys are stronger than the girls.