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

A. Ø

B. an

C. the

D. a

Câu 1: Mark hopes _______ a small part in the school play.

A. to get

B. getting

C. get

D. got

Câu 2: The students got the librarian_________ books for them.

A. buying

B. to buy

C. buy

D. bought

Câu 3: 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 4: We _________ already ________ Huong Pagoda.

A. were…seeing

B. have…seen

C. are…seeing

D. will…see

Câu 5: The first color TV _____________ in 1928.

A. produce

B. is produced

C. was produced

D. produced

Câu 6: It was hot, _________ I turned on the conditioner.

A. however

B. but

C. because

D. so