Câu hỏi: All classifications of human societies and cultures are arbitrary.

A. useful

B. haphazard

C. insufficient

D. ambiguous

Câu 1: The event, watched by millions of people all over the country, takes place annually.

A. sometimes

B. once every year

C. regularly

D. smoothly

Câu 2: The Bali Tiger was declared extinct in 1937 due to hunting and habitat loss.

A. reserve

B. generation

C. natural environment

D. diversity

Câu 3: The collapse of the stock market in 1929 signaled the beginning of the Depression.

A. debt

B. rebirth

C. rise

D. failure

Câu 4: It was inevitable that the smaller company should merge with the larger one.

A. vital

B. unnecessary

C. urgent

D. unavoidable

Câu 5: With respect to maneuverability, few birds can equal the capabilities of the hummingbird, which hovers for long periods and even flies backward.

A. With regard to

B. With fondness to

C. In appreciation of 

D. In favor of

Câu 6: Most of the school-leavers are sanguine about the idea of going to work and earning money.

A. fearsome

B. expected

C. excited

D. optimistic