Cirle the best option A, B, Cor D to complete the sollowing sentences

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3. Cirle the best option A, B, Cor D to complete the sollowing sentences.
1. Remenmber
A. to turn the light before leaving the room
B. to turn off light before leaving the room
C. turn off the light before leaving the room
D. to turn off the light before leaving the room
2. People should respect and try to protect the environment. Otherwise,
A. the ecology will become unbalanced
B. the ecology would become unbalanced
C. the ecology become unbalanced
D. the ecology became unbalanced
3. It's necessary that.
A. we may to protect the environment
B. should protect the environment
C. we should protect the environment
D. we should protected the environment
4. The air
A. was also pollute
B. are also pollute
C. is also polluted
D. is also pollution
5. Many people do not want to live in big cities because
A. big cities is very busy
B. big cities are very busy, noisy and expensive
C. big cities will be very noisy
D. big cities are very clean