Câu hỏi: ......... European expert was invited to speak to the committee.

A. a

B. an

C. the

D. x

Câu 1: The children have ........ new teacher called Mr. Green.

A. a

B. an

C. the

D. x

Câu 2: Dad turned on ...... radio to listen to ......... news.

A. a/ a

B. a/ the

C. the/ the

D. the/  a

Câu 3: It would help us if you gave ..... honest opinion.

A. a

B. an

C. the

D. x

Câu 4: ..... recipe for ......... success is  .......... hard work.

A. The/  X/  X

B. The/  a/  the

C. X/  a/  X 

D. X/  the/  X

Câu 5: We need to protect ....... environment from pollution.

A. some

B. a

C. an

D. the

Câu 6: We often go to school by ........ bicycle.

A. some

B. a

C. an

D. the