Unit 4 -

You ​ ______ turn off the lights when you leave the room. ​

• should
• shouldn't
• haven't
• aren't

You shouldn't ______ litter.

You _______ swap clothes.

• Shouldn't

• should

• Haven't to

• has

You _______ waste food.

She ______ pick up the litter.

He ________ recycle paper and glass.

• have to

• should

• shouldn't

• are

You _______ waste water.

• shouldn't

• should

• have to

• is

You _______ recycle metal.

He __________ throw away plastic.

• is

• should

• shouldn't

• are