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: The waste water from bath, showers, sinks and_______, and rainwater can be collected in a tank.

A. linguistic

B. official

C. dishwasher

D. operate

Câu 2: He had a new heart valve _______.

A. added

B. supplanted

C. improved

D. implanted

Câu 3: She finally achieved her_______ of visiting the USA.

A. target

B. objective

C. desires

D. ambition

Câu 4: Because of people’s______ with the environment, many kinds of plants and animals are becoming rare.

A. supply

B. survival

C. influence

D. interference

Câu 5: We kept in _______for a while after college.

A. touch

B. pay

C. well

D. chose

Câu 6: The problem of_______ in big cities, which stems from uncontrolled migration from rural areas.

A. overpopulation

B. decrease

C. increase

D. growth