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

A. x

B. a

C. the

D. an

Câu 1: Quick! Someone call ....... police. I need help right now.

A. a

B. an

C. the

D. x

Câu 2: I want to introduce you to Sharon. She is ........ very nice person.

A. a

B. an

C. the

D. x

Câu 3: Do you like ........ my new glasses?

A. a

B. an

C. the

D. x

Câu 4: Canada is one of ......... biggest countries in the world.

A. a

B. an

C. the

D. x

Câu 5: It is fun to learn English on ....... computer.

A. a

B. an

C. x

D. the

Câu 6: There was  .......... piano in the corner of the room.

A. a

B. an

C. x

D. the