Câu hỏi: Solar energy is not only plentiful but also infinite.

A. without limit

B. boundless

C. limited

D. indefinite

Câu 1: She wrote me a vicious letter.

A. helpful

B. gently

C. dangerous

D. healthy

Câu 2: A chronic lack of sleep may make us irritable and reduces our motivation to work.

A. uncomfortable

B. responsive

C. calm

D. miserable

Câu 3: His replies were inconsistent with his previous testimony.

A. contradicted

B. compatible

C. enhanced

D. incorporated

Câu 4: There has been no discernible improvement in the noise levels since lorries were banned.

A. insignificant

B. clear

C. obvious

D. thin

Câu 5: During the five- decade history the Asian Games have been advancing in all aspects.

A. holding at

B. holding back

C. holding to

D. holding by

Câu 6: We are very grateful to Professor Humble for his generosity in donating this wonderful painting to the museum.

A. meanness

B. sympathy

C. gratitude

D. churlishness