Câu hỏi: Human beings are ________ greatest threat to survival of endangered species.

A. Ø

B. an

C. the

D. a

Câu 1: It is of great ________ to show your interest and politeness when you are having a job interview.

A. important

B. importance

C. importantly

D. unimportant

Câu 2: In an essay writing in 1779, Judith Sargeant Murray promoted the cause of women's education.

A. the cause of

B. writing

C. In an essay

D. women's education

Câu 3: The view is great, _______?

A. isn't it

B. was it

C. doesn't it

D. did it

Câu 4: Mike came across his old friend - Maria while he _______ along the street.

A. had walked

B. would walk

C. was walking

D. walked

Câu 5: It was hot, _________ I turned on the conditioner.

A. however

B. but

C. because

D. so

Câu 6: The students got the librarian_________ books for them.

A. buying

B. to buy

C. buy

D. bought