We can _____(save) water by _____(not brush) our teeth under a running tap.

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We can _____(save) water by _____(not brush) our teeth under a running tap.
We can _____(save) water by _____(not brush) our teeth under a running tap.

We can _____(save) water by _____(not brush) our teeth under a running tap.
We can save water by not brushing our teeth under a running tap.
by 是介词,后面要跟动名词.

save... not brushing

save not brushing