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

A. without limit

B. boundless

C. limited

D. indefinite

Câu 1: Her thoughtless comments made him very angry.

A. honest

B. kind

C. pleasant

D. thoughtful

Câu 2: Population growth rates vary among regions and even among countries within the same region.

A. restrain

B. stay unchanged

C. remain unstable

D. fluctuate

Câu 3: My first impression of her was her impassive face.

A. emotional

B. respectful

C. solid

D. fractious

Câu 4: With her sophiscated tastes, the singer has become an omnipresent icon of style and beauty.

A. oblivious

B. controversial

C. ubiquitous

D. unknown

Câu 5: We'd better speed up if we want to get there in time.

A. slow down

B. turn down

C. put down

D. lie down

Câu 6: There has been no discernible improvement in the noise levels since lorries were banned.

A. insignificant

B. clear

C. obvious

D. thin