Câu hỏi: In the United States, a party can nominate a single candidate for office.

A. refuse

B. keep

C. change

D. appoint

Câu 1: In the 1776 pamphlet "Common Sense," Thomas Paine defended the cause of the American Revolution.

A. fought

B. championed

C. exposed

D. believed

Câu 2: Helen Keller, blind and deaf from an early age, developed her sense of smell so finely that she could identify friends by their personal odors.

A. classify

B. recognize

C. describe

D. communicate with

Câu 3: I told you clearly and definitely not to write your answers in pencil, Smith!

A. considerably

B. thoroughly

C. altogether

D. specificially

Câu 4: Studies of climatology indicate that volcanic dust in the atmosphere may contribute to the onset of ice ages.

A. explain

B. insinuate

C. suggest

D. prove

Câu 5: 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 6: Before the earthquake hit the area,many minor tremors were felt.

A. spasms

B. noises

C. vibrations

D. crumblings