To protect the environment, what do you have to do?
1. I'd better use less water.
2. I'd better take the stairs instead of the elevator.
3. I'd better ride my bike to school.
4. I'd better use less electricity.
5. I'd better not use paper cups or plates.
6. I'd better not use electricity too much.
7. I'd better not use too much electricity.
8. I'd better not throw away garbage into the river.
9. I'd better not drive my car too often.
10. I'd better not take a shower every day.
11. I'd better not take a escalator.
12. I'd better not turn on or off computers too often.
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Are the answers all grammatical and suitable?
All are correct.
However, 7 is better than 6.