23 B => happier ( so sánh hơn : S1 + be + adj-er + than S2)
24 A => much ( sugar : N không đếm được)
25 C => better ( good => better => best)
........
1 Her new house is smaller than her old one.
2 The white dress is cheaper than the black one
3 According to me, Maths is more difficult than English
_ So sánh hơn : S1 + be + adj-er/more adj + than + S2