Should or shouldn't?

I ___ turn off the tap while I brush my teeth.

• should

• shouldn't

I ___ turn off the lights when I leave the room.

• should

• shouldn't

We ___ cut the trees.

• should

• shouldn't

We ___ separate garbage.

• should

• shouldn't

We ___ take long showers.

• should

• shouldn't

We ___ leave the TV on all the time

• should

• shouldn't

We ___ use a car for short distances.

• should

• shouldn't

We ___ go green.

• should

• shouldn't