Câu hỏi: English is the _____ language on one- fifth of the land area of the world.

A. office

B. official

C. officer

D. officially

Câu 1: I can't remember the name of the man _____ I gave the money.

A. who

B. whom

C. whose

D. which

Câu 2: He used _____ next to me in class.

A. to sit

B. sit

C. to sitting

D. to sat

Câu 3: He drives very _____ and has got two accidents this year.

A. careless

B. carefully

C. carelessly

D. careful

Câu 4: She can't stand _____ her at home all day.

A. seeing

B. see

C. to see

D. saw

Câu 5: There is a _____ difference between the north and the south.

A. region

B. regional

C. regionally

D. regioner

Câu 6: My sister likes _____ and _____.

A. dance/ sing

B. to dance/ sings

C. dancing/ singing

D. dancing/ to sing