B1.4-Teens-U2 vocabulary

__ are beneficial to humans.

• Pests

• Bees

Some snakes are __.

• filthy

• poisonous

We __ the environment when we cut down trees.

• conserve

• destroy

Rubbish smells terrible. It's __.

• crucial

• disgusting

Cities try to __ the number of pigeons living there.

• control

• decay

__ are all around us. We must try to be clean.

• Stings

• Germs

This word describes an animal that might attack you.

This word describes a fish or snail: s____.

This word means very dirty.