1. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

The Earth Day comes from the idea of a former US politician Gaylord Nelson. He was worried about the world pollution, and the health of plants and animals. In 1969, he decided that the world should have a special day to teach people about how to make environment better.

His idea became popular and on 22 April 1970 the first Earth Day was celebrated. Since then, environmentalists have used the day to educate people about their roles in protecting our planet. Earth Day finally became a global celebration around the world. On this day, people come together to talk about global warming, protecting rare animals and saving energy sources.

Question 19: The word “their” in the second paragraph refers to ______.

A. environmentalists’

B. people’s

C. politicians’

D. Dr. Nelson’s

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Giải thích: Để tránh nhắc lại từ "environmentalists": những nhà môi trường học, người ta sử dụng tính từ sở hữu là "their": họ. Sau tính từ sở hữu là danh từ. 

2. Choose the best answer A, B, C or D to complete the sentence.

Question 11: ___________ there was a lot of acid rain, many botanical species died last year.

A. Since 

B. But

C. So

D. Although

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Giải thích:

A. Since: Vì, bởi vì (Since + S + V, S+V, chỉ nguyên nhân → dẫn đến kết quả) ≈ as, because 

B. But: Nhưng (chỉ sự đối lập giữa hai mệnh đề)

C. So: Vì vậy, do đó (chỉ hậu quả) 

D. Although: mặc dù (Although + clause)

Dịch: Vì đã có nhiều mưa axit (nên), nhiều loài thực vật chết mỗi năm.