Câu hỏi: People are not allowed enter the park after midnight because of lack of security.

A. allowed enter

B. after

C. because of

D. of

Câu 1: It was not until the end of prehistoric times that the first wheeled vehicles appearing

A. It was

B. prehistoric

C. wheeled vehicles

D. appearing

Câu 2: The amount of women earning Master's Degrees has risen sharply in recent years.

A. The amount of

B. Master’s

C. has risen

D. recent years

Câu 3: Of all the art-related reference and research library in North America, that of the Metropolitan Museum of Art in New York City is among the largest and most complete.

A. Of all

B. reference and research

C. library

D. that of

Câu 4: Dinosaurs became extinct millions of years ago because of the earth's climate changed drastically.

A. became extinct

B. because of

C. The earth’s

D. drastically

Câu 5: Women in many parts of the world have had lower status than men, which the extent of the gap between genders varies across cultures and times.

A. many

B. lower

C. which

D. across cultures and times

Câu 6: It was not when he talked to her that he knew the truth.

A. was not

B. when

C. talked to

D. knew the truth