$\text{1.}$ Trapical rain forests are found in Amazon region of South America . 

→ Dẫn chứng : Trapical rain forests are found in Amazon region of South America . ( Câu đầu tiên của đoạn văn ) 

$\text{2.}$ The Amazon rain forests produce about 30 to 40 percent of the world's oxygen. 

→ Dẫn chứng : The Amazon rain forests alone receive about 30 to 40 per cent of the total rainfall on the earth and produce about the same percentage of the world's oxygen.

$\text{3.}$ The decreasing size of rain forests affect the climate on the earth will make it uncomfortable or even dangerous for life. 

→ Dẫn chứng : Some scientists believe that the decreased size of rain forests will affect the climate on the earth, making it uncomfortable or even dangerous for life. 

$\text{4.}$ No , it isn't . 

→ Dẫn chứng : Saving our rainforests is an international problem. 

$#Keisha$