Câu hỏi: David, who mother is Vietnamese, speaks both Vietnamese and English fluently.

A. who

B. is

C. speaks 

D. fluently

Câu 1: Oxygen plays a important role in maintaining live.

A. a

B. plays

C. role

D. live

Câu 2: Both Mr. and Mrs. Smith are explaining the children the rules of the game.

A. Both Mr. and Mrs. Smith

B. are

C. explaining

D. the children the rules of the game

Câu 3: There are many reasons why a particular species may become endangering.

A. endangering

B. may

C. a

D. reasons why

Câu 4: The teacher together with his students have finished their project on time.

A. The

B. together 

C. have

D. their

Câu 5: If I had studied carefully, I wouldn't made so many mistakes.

A. I had

B. carefully

C. made

D. so many

Câu 6: He passed the exams with high scores, that made his parents happy.

A. passed

B. with

C. that 

D. happy