Everyone ____ pick up their rubbish.
can't
must
mustn't
We ____ recycle plastic bottles.
have to
don't have to
can't
People ____ fish in the river.
don't have to
mustn't
must
You ____ use your phone in the cinema.
have to
mustn't
must
We ____ stop throwing trash in the ocean.
can't
must
don't have to
Boats ____ dump oil into the sea.
mustn't
must
have to
Fishermen ____ catch too many fish.
must
mustn't
don't have to
You ____ use reusable bags to reduce waste.
mustn't
don't have to
have to
Factories ____ dump waste into rivers.
can't
mustn't
must
We ____ protect coral reefs from destruction.
mustn't
must
can't
You ____ swim in areas with dangerous animals.
mustn't
must
don't have to
We ____ reduce our use of plastic bags.
have to
can't
mustn't
People ____ waste clean water.
don't have to
have to
mustn't
You ____ pick up litter on the beach.
don't have to
must
can't
We ____ protect endangered sea creatures.
don't have to
have to
can't
You ____ take seashells from the beach.
must
have to
mustn't
