Many poor people live in the ____________ of Rio.

Pollution is  a great ___________ to our existence.

Mary is ____________ to help those in need.

______________ is the opposite of freedom.

The white lion is a(n) _________________________ . There aren't many left.

Peter __________________ what Mary was saying and continued reading his emails.

As a result of _________________________ sea levels are rising.

As a result of _______________ a lot of animals are now endangered.

School ______________ is a big problem, students should learn to argue without hitting each other.

I could hear the _____________ of thunder in the distance.