1. (2020·哈尔滨模拟) Water is very valuable for human beings. Therefore, it's everyone' s duty to save wa­ter. We are supposed to __________ to save water.

①drink less water every day

②take a short shower instead of a bath

③turn off the water when you brush your teeth

④use the water we finish washing the clothes to clean the floor

⑤leave the water running when washing faces