Everyone ____ be careful with fire near forests.
must
don't have to
can't
We ____ protect endangered sea creatures.
don't have to
have to
can't
We ____ stop throwing trash in the ocean.
can't
don't have to
must
Factories ____ dump waste into rivers.
mustn't
must
can't
Tourists ____ leave trash behind.
have to
mustn't
don't have to
People ____ fish in the river.
don't have to
mustn't
must
You ____ use your phone in the cinema.
mustn't
have to
must
Boats ____ dump oil into the sea.
must
mustn't
have to
Factories ____ reduce air pollution.
must
don't have to
can't
You ____ swim in areas with dangerous animals.
must
mustn't
don't have to
You ____ scream in the library.
can't
have to
must
People ____ waste clean water.
have to
mustn't
don't have to
We ____ recycle plastic bottles.
can't
have to
don't have to
You ____ pick up litter on the beach.
can't
don't have to
must
We ____ protect the sea creatures
can't
have to
mustn't
Fishermen ____ catch too many fish.
must
don't have to
mustn't
You ____ use reusable bags to reduce waste.
mustn't
don't have to
have to
You ____ take seashells from the beach.
must
mustn't
have to
You ____ do your homework.
have to
mustn't
can't
We ____ protect coral reefs from destruction.
mustn't
must
can't
Everyone ____ pick up their rubbish.
mustn't
must
can't
You ____ eat children
mustn't
must
have to
You ____ throw chemicals into the water.
mustn't
have to
must
We ____ reduce our use of plastic bags.
mustn't
have to
can't