Choose the best word or word combination to complete each sentence.

Choose the correct option.

Last summer was [warm|warmer|warming] than usual.

We need to create and apply [environment|environmental|environmentally] cleaner means of transport.

Factories all over the world are [pollute|polluting|pollution] water, air, and ground every second.

[Home|Homeless|Homelessness] people need our help and protection.

Mike decided to paint his [house green|green house|greenhouse] and yellow.

I'm going to do a project about [danger|endanger|endangered] species in South America.