Câu hỏi: Let’s _________ water by turning off tapes when not using.

A. save

B. to save

C. saving

D. saved

Câu 1: I was ...... to find that the film was quite ……

A. surprised - frightening

B. surprised - frightened

C. surprising - frightening

D. surprising – frightened

Câu 2: The ...... friendly products are designed not to harm the natural environment.

A. environment

B. environmental

C. environmentally

D. environmentalism

Câu 3: People are destroying the air by adding ...... to it.

A. pollutants

B. polluters

C. pollution

D. polluted

Câu 4: I threw my old trainers and bought some new .................. .

A. ones

B. one

C. some

D. any

Câu 5: A hydroelectric dam ______________ in this area now.

A. is building

B. is being built

C. build

D. was built

Câu 6: The waste from the chemical factory is extremely .......

A. harm

B. harmful

C. unharmed

D. harmless