Complete the task. Mike is an eco-helper. He is giving some recommendations for the people who care about nature. Choose the correct modal verbs to complete his statements.

Choose the correct option.

You [don't need|need] to plant trees everywhere. It's pointless.

You [should|mustn't] smoke in the forests or other green places.

You [can|can't] ride a bike instead of driving a car. It's much better for the environment.

You [have to |don't have to] participate in every ecological campaign. It's not necessary.