Câu hỏi:

Will your class visit the hydro power station in Hoa Binh next week?

The government has warned that Britain will face power ___________ in the coming winters.

When will the non-renewable energy sources be use up?

 ___________ can be an excellent source of free, renewable energy for poor farmers.

Two layers of glass in the window will be stopped the heat going out.

In India, the demand for ___________ has always been more than the supply.

There are many available ___________ power sources in Vietnam including sun, wind, water, etc.