Nowadays, we don't have enough resources to use. So it's everyone's duty to save them for the future. To save resources, we should ________________.

① throw away a pencil without completely using it

② collect waste things for recycling

③ go to school by bike instead of by car

④ turn off the tap while brushing our teeth

⑤ keep the lights on day and night

A、①②⑤

B、②③④

C、②④⑤