Câu hỏi: The 1908 Siberian meteorite explosion brought about considerable depletion of the northern hemisphere's ozone layer.

A. was caused by

B. resulted in

C. brought back

D. was initiated by

Câu 1: In Benjamin Franklin's almanac, he warns against making hasty decisions.

A. expensive

B. unhealthy

C. firm

D. quick

Câu 2: The famous racehorse Secretariat had to be destroyed because of a painful, incurable hoof disease.

A. disabling

B. vexatious

C. dangerous

D. irreparable

Câu 3: The sales of drugs is controlled by law in most of countries.

A. permitted

B. restricted

C. illegal

D. binding

Câu 4: I told you clearly and definitely not to write your answers in pencil, Smith!

A. considerably

B. thoroughly

C. altogether

D. specificially

Câu 5: Scientists warn of the impending extinction of many species of plants and animals.

A. irrefutable

B. imminent

C. formidable

D. absolute

Câu 6: In the 1776 pamphlet "Common Sense," Thomas Paine defended the cause of the American Revolution.

A. fought

B. championed

C. exposed

D. believed