a,2

b,1

c,3

d,4

Tục ngữ

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
It is essential that every student______the exam before attending the course.

A. pass

B. passes

C. would pass

D. passed

x, many animals can still survive and thrive there.

A. Athough the weather conditions in the desert severe 

B. Severe though the weather conditions in the desert are 

C. Even though the weather conditions in the desert is severe 

D. Severe as the weather conditions in the desert