Câu hỏi: Sam is _______ man to speak at the conference tomorrow.

A. x

B. a

C. the

D. an

Câu 1: Birds can fly in _________ sky.

A. an

B. the

C. x

D. a

Câu 2: She needs ________ water. She is really thirsty.

A. a

B. an

C. the

D. x

Câu 3: Lisa met one of her old friends on his way _____ home from Vancouver.

A. a

B. an

C. the

D. x

Câu 4: What _____ day we are having today!

A. an

B. the

C. x

D. a

Câu 5: Canada is one of ________ biggest countries in the world.

A. a

B. an

C. the

D. x

Câu 6: Do you like _______ my new glasses?

A. a

B. an

C. the

D. x