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

A. insignificant

B. clear

C. obvious

D. thin

Câu 1: It was apparent from her face that she was really upset.

A. obvious

B. indistinct

C. transparent

D. evident

Câu 2: Solar energy is not only plentiful but also infinite.

A. without limit

B. boundless

C. limited

D. indefinite

Câu 3: Strongly advocating health foods, Jane doesn’t eat any chocolate.

A. supporting

B. impugning

C. advising

D. denying

Câu 4: My cousin tends to look on the bright side in any circumstance.

A. be optimistic

B. be pessimistic

C. be confident

D. be smart

Câu 5: With her sophiscated tastes, the singer has become an omnipresent icon of style and beauty.

A. oblivious

B. controversial

C. ubiquitous

D. unknown

Câu 6: A chronic lack of sleep may make us irritable and reduces our motivation to work.

A. uncomfortable

B. responsive

C. calm

D. miserable