Save the world

We____use public transportation more.

• should

• shouldn't

We ____ cut down the trees.

• should

• shouldn't

We ____ turn off electric devices when we don't use them.

• should

• shouldn't

We ____ waste paper to save our trees. We ____ recycle them.

• should/shouldn't

• shouldn't/should

We ____ turn off the tap when we don't use it.

• should

• shouldn't

We ___ put garbage in the bin.

• should

• shouldn't

We ___ throw garbage on the street.

• should

• shouldn't

We ____ throw garbage into the river.

• should

• shouldn't

We should ____ solar energy more.

• use

• used

• using

• uses

We ____ use electric cars.

• should

• shouldn't