Câu hỏi:

I (send) ………………….………….. you my book tomorrow.

We will be using biogas for cooking and heating at this time next month.

→ Biogas ………………………………

Choose and circle the best answer.

Wind, hydro and solar are ……… energy sources.

Nick washes his hand a lot, .....he doesn’t have flu.

Choose the word having different stress from the others.

Some new energy-saving bulbs …………. in the dining-room.

We will cut down on the use of natural gas because it is …….… & harmful to the environment.