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

A. the/  X

B. X/  the

C. the/  the  

D. X/  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: We watch television after .................. dinner.

A. a

B. an

C. the

D. x

Câu 4: Last night there was .......... singing outside my house.

A. a

B. an

C. the

D. x

Câu 5: ................ Mekong River is .............longest river in.................... Vietnam.

A. the/  X/  the

B. the/  the/  the

C. X/  X/  the

D. the/  the/  X

Câu 6: He usually travels to..................Philadelphia by.................. train.

A. the/  X

B. X/  the

C. the/  the

D. X/  X