Câu hỏi: I will keep ____ eye on the baby when its father is away.

A. an

B. much

C. the

D. one

Câu 1: Canada is one of ________ biggest countries in the world.

A. a

B. an

C. the

D. x

Câu 2: Quick! Someone call _____ police. I need help right now.

A. a

B. an

C. the

D. x

Câu 3: Birds can fly in _________ sky.

A. an

B. the

C. x

D. a

Câu 4: Wendy is ______ eleven-year-old girl.

A. a

B. the

C. an

D. x

Câu 5: Can you play _______ piano?

A. a

B. an

C. the

D. x

Câu 6: She needs ________ water. She is really thirsty.

A. a

B. an

C. the

D. x