Câu hỏi: The journalist refused to disclose the sourse of his information.

A. open

B. reveal

C. shut

D. conceal

Câu 1: Professor Berg was very interested in the diversity of cultures all over the world.

A. variety

B. changes

C. conservation

D. number

Câu 2: She came to the meeting late on purpose so she would miss the introductory speech.

A. aiming at

B. intentionally

C. reasonably

D. with a goal

Câu 3: When we went to the airport to see her off, we had a traffic jam.

A. say good bye to her

B. meet her

C. take care of her

D. look for her

Câu 4: Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

A. record

B. shine

C. categorize

D. diversify

Câu 5: The use of lasers in surgery has become relatively commonplace in recent years.

A. comparatively

B. relevantly

C. absolutely

D. almost

Câu 6: The bomb exploded in the garage; fortunately no one hurt.

A. taken off

B. went off

C. put on

D. hold up