=>
38. The paddy fields in the mountains are usually not as large as those in the low lands.
-> so sánh bằng as adj as
39. The path through Dead Valley is the most dangerous in my country.
-> so sánh nhất the most adj
40. A city has more interesting activities than the countryside.
-> more...than : nhiều hơn
39. Lang Lieu couldn't buy any special food because he was very poor.
-> because S V : bởi vì
40. Although most of Vietnamese are tired preparing for Tet, they look forward to it.
-> although S V : mặc dù