My father (install) _____________________ a biogas cooker in the kitchen, and the workers (put) ____________________ solar panels on the roof of our house.

The music (get) _______________________ louder and louder. Many people (put) _______________________ their hands over their ears.

Now scientists (develop) _______________________ new energy sources to protect the environment.

The boys (not/ do) _______________________ their homework at the moment. They (watch) ____________________ TV instead

. Mai (read) ________________________ about renewable energy, and Nam (do) ______________________ a project on local environment.

Her mother (not/ have) ____________________ a nap now. She (water) ___________________ the plants.

Do you want to play football? - Not now. I (have) ______________________dinner.

Why (the company/ look) __________________________ for new sources of drinking water?

Now we (look) ______________________ for a cheap, clean and efficient energy source.

. The changing lifestyle of modern man (pollute) _______________________ our environment.