Câu hỏi: I_______ George on my way home.

A. dropped in on

B. gear up for

C. pair up with

D. look back on

Câu 1: In military, A.I. robots are used to _______ dangerous environments containing explosives or contaminated by nuclear weapons.

A. change

B. explore

C. fix

D. borrow

Câu 2: He had a new heart valve _______.

A. added

B. supplanted

C. improved

D. implanted

Câu 3: The problem of_______ in big cities, which stems from uncontrolled migration from rural areas.

A. overpopulation

B. decrease

C. increase

D. growth

Câu 4: He formerly worked as a machinist_______ in Boeing's Everett assembly plant.

A. appriciate

B. apprentice

C. appraise

D. approach

Câu 5: Teachers complain that more of their time is taken up with _______than with teaching.

A. protection

B. administration

C. architecture

D. article

Câu 6: The society was set up to______ endangered species from extinction.

A. prevent

B. distinguish

C. preserve

D. survive