Câu hỏi: I found myself at a loss to understand my closest friend's words. 

A. I found my closest friend's words easy to understand.

B. I found my closest friend's words quite incomprehensible.

C. I lost my heart and didn't understand my closest friends' words.

D. I understood my closest friend's words completely.

Câu 1: The creation of nature reserves will help to ensure the _____ of many endangered species. 

A. survive

B. survival

C. survivor

D. survivable

Câu 2: There are 350 ________ in the environmental skills course

A. participate 

B. participant 

C. participants

D. participation

Câu 3: Deforestation in South America is an issue of ____ importance. 

A. global 

B. globe 

C. globalist

D. globalize

Câu 4: When I arrived, they were having dinner. 

A. They ate their dinner as soon as I arrived.

B. When they started having their dinner, I arrived.

C. I came in the middle of their dinner.

D. They invited me to dinner

Câu 5: The council intends to raise awareness of the effects of traffic pollution on our          

A. health 

B. healthy

C. unhealthy

D. healthful

Câu 6: She said, "John, I'll show you around my city when you're here."

A. She made a trip around her city with John. 

B. She promised to show John around her city.

C. She didn't want to show John around her city.

D. She organized a trip around her city for John.