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

A. who

B. is

C. speaks 

D. fluently

Câu 1: Optimists believe that in future we will be living in a cleaner environment, breathing fresher air and eat healthier food.

A. Optimists believe

B. in future

C. living in a cleaner

D. eat healthier food

Câu 2: She did not know where most of the people in the conference was from.

A. did not

B. where

C. the

D. was

Câu 3: My father asked me where had I gone the night before.

A. asked

B. the 

C. before

D. had I

Câu 4: Mr. Smith, along with her cousins from Canada, are planning to attend the firework display in Da Nang, Vietnam.

A. with

B. her cousins

C. are

D. to attend

Câu 5: Oxygen plays a important role in maintaining live.

A. a

B. plays

C. role

D. live

Câu 6: If I had studied carefully, I wouldn't made so many mistakes.

A. I had

B. carefully

C. made

D. so many