Câu hỏi: He formerly worked as a machinist_______ in Boeing's Everett assembly plant.

A. appriciate

B. apprentice

C. appraise

D. approach

Câu 1: The society was set up to______ endangered species from extinction.

A. prevent

B. distinguish

C. preserve

D. survive

Câu 2: I_______ George on my way home.

A. dropped in on

B. gear up for

C. pair up with

D. look back on

Câu 3: Intelligent ___________ are widely used in many fields such as heavy industries, hospital medicine business, and the military.

A. machines

B. service

C. advisement

D. computers

Câu 4: The problem of_______ in big cities, which stems from uncontrolled migration from rural areas.

A. overpopulation

B. decrease

C. increase

D. growth

Câu 5: He had a new heart valve _______.

A. added

B. supplanted

C. improved

D. implanted

Câu 6: The_______ of living here, of course, is that it is expensive.

A. glorious

B. athletic

C. strategy

D. downside