Câu hỏi: Some of the participating schools have also decided to use green cleaning products, which are safer since they do not ……. harmful chemicals into the environment.

A. release

B. expose

C. compound

D. deplete

Câu 1: Billy, come and give me a hand with cooking.

A. help

B. prepared

C. be busy

D. attempt

Câu 2: Many plants and animal species are now on the _______ of extinction.

A. danger

B. border

C. margin

D. verge

Câu 3: When someone …………… a poem or other piece of writing, they say it aloud after they have learn it.

A. recites

B. takes part in

C. completes

D. complete

Câu 4: Whenever problems come up, we discuss them frankly and find solutions quickly.

A. happen

B. encounter

C. arrive 

D. clean

Câu 5: The computer has had an enormous _________ on the way we work.

A. alteration

B. change

C. impression

D. influence

Câu 6: He is one of the most ………. bosses I have ever worked with. He behaves rudely to not only me but also others in the staff.

A. thoughtful

B. impolite

C. attentive

D. communicative