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

A. uncomfortable

B. responsive

C. calm

D. miserable

Câu 1: She wrote me a vicious letter.

A. helpful

B. gently

C. dangerous

D. healthy

Câu 2: The only means of access to the station is through a dark subway.

A. arrival

B. admission

C. outlet

D. output

Câu 3: My mom is always bad-tempered when I leave my room untidy.

A. feeling embarrassed

B. talking too much

C. very happy

D. easily annoyed

Câu 4: 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 5: 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

Câu 6: 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