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

A. some

B. a

C. an

D. the

Câu 1: The tomatoes are 99 pence .......... kilo.

A. a

B. an

C. the

D. x

Câu 2: It would help us if you gave ..... honest opinion.

A. a

B. an

C. the

D. x

Câu 3: Ben has ........... terrible headache.

A. a

B. an

C. the

D. x

Câu 4: The Mississippi river is in ........ United States of America.

A. a

B. an

C. the

D. x

Câu 5: Alex is in Boston studying for .... MBA.

A. a

B. an

C. the

D. x

Câu 6: Jennifer tasted ........ birthday cake her mother had made.

A. a

B. an

C. the

D. x