Câu hỏi: 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 1: 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 2: Adverse reviews in the New York press may greatly change the prospects of a new Broadway production.

A. subversive

B. additional

C. encouraging

D. unfavorable

Câu 3: 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 4: I didn’t go to work this moring. I stayed at home because of the morning rain.

A. thanks to

B. on account of

C. in spite of

D. in addition to

Câu 5: I told you clearly and definitely not to write your answers in pencil, Smith!

A. considerably

B. thoroughly

C. altogether

D. specificially

Câu 6: He was fired because of his misconduct at the office party.

A. mistake

B. impropriety

C. condition

D. singing