Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27.
The warming of the Earth is caused by exhaust gas from automobile engines, fatories and power (23)_________. Carbon dioxide goes up into the atmosphere, and it form a kind of screen that keeps or allows the sunshine in but stop the Earth heart (24) _________getting out. It works like a greenhouse, that’s why we call (25) _________the Green House effect. Because of this effect, the Earth is getting warmer all the time. This (26) _________in temperature will cause big changes to the world’s climate. The sea level will increase as the ice (27) _________the poles will melt.
Điền vào ô trống 25
A. is
B. be
C. it
D. them
C
Sau động từ, ta cần dùng một tân ngữ
Vế phía trước có dùng chủ ngữ it, vì thế ở đây tiếp tục dùng tân ngữ “it”
=> Đáp án C