What can we do to save water?

Question

1. We can turn off the water when we are not using it.
2. We can turn off the water when we are brushing teeth.
3. We can use only a little water when we wash face.
4. We can use a little water when we wash hair.
5. We can take a shower every two days, not every day.
6. We can take a shower with a little water.
7. We can use the river water instead of the city water.
8. We can reuse the water we use to wash face.
9. We can turn off the city water when we do the dishes with the water in the basin.
10. We can unuse a lot of water when we take a bath.
11. We can go to a public bath not to waste a lot of water in the bathroom at home.
===================
Would you check the sentences? Correct errors, please. Thank you.

Answer 1

1 is good.
2 is good.
3 is good
4 3 is better than 4
5 is good
6 would be better if you add "...ONLY a little..."
7 is good
8 would be better, since the subject WE is plural, make the rest of the sentence agree. "...we use to wash OUR FACES."
9. is good
10. is not good. Instead of "unuse," which is not an English word, write, "We can use less water..."
11 is okay, but awkward. It would be better to write "...public bath so as not..." or "...public bath to avoid using a lot of water..."