Выбери must или mustn't где нужно. *
must
mustn't
We protect the animals!
I take an umbrella when its raining.
She drop litter when she goes camping.
People pollute air and water.
You mix yogurt and fish!
We protect the animals!
I take an umbrella when its raining.
She drop litter when she goes camping.
People pollute air and water.
You mix yogurt and fish!
