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

A. a

B. plays

C. role

D. live

Câu 1: The teacher together with his students have finished their project on time.

A. The

B. together 

C. have

D. their

Câu 2: 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 3: My father asked me where had I gone the night before.

A. asked

B. the 

C. before

D. had I

Câu 4: 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 5: 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 6: It is important that you turned off the heater every morning before you leave for class.

A. turned off

B. before

C. important

D. leave for