Câu hỏi: Scientists sent ............ expedition to ............ Mars during .......... 1990s.

A. an/  X/  the

B. an/  the/  the

C. X/  X/  the

D. X/  X/  X

Câu 1: Every year, thousands of tourists visit ……... Nile River.

A. a

B. an

C. the

D. x

Câu 2: ..................    money    you    gave    me    is    not    enough    to    buy ..................bicycle.

A. the/  X 

B. X/  the

C. the/  the

D. X/  X

Câu 3: Rita is studying........... English and ...........math this semester.

A. the/  X

B. X/  the

C. the/  the  

D. X/  X

Câu 4: Jason's father bought him ............ bicycle that he had wanted for his birthday.

A. a

B. an

C. the

D. x

Câu 5: ...........Lake Erie is one of five Great Lakes in ........... North America

A. a/  X/  the 

B. a/  the/  the

C. X/ X/ X

D. X/  X/  a

Câu 6: ......... chair which you are sitting in is broken.

A. a

B. an

C. the

D. x