Choose the best answers to complete the sentences

I. Choose the best answers to complete the sentences.

1. By the middle of the 21st century, people in …………… countries will be using more renewable energy.

A. developing B. develop C. to develop D. development

2. Alternative sources of energy___ developed in the near future.

A. is B. was C. has been D. will be

3. “Why is it called a ____________ source?” – “Because it can be replaced easily and quickly.”

A. effective B. specific C. renewable D. non-renewable

4. Hydro power is _____________ because dams cannot be built in certain areas.

A. limited B. unlimited C. abundant D. enough

5. At this time next week, we ______________ a wind turbine in our garden.

A. install B. installed

C. will installed D. will be installing

6. Biogas is _____ and cheap for cooking and heating.

A. plenty B. abundant C. serious D. expensive

7. A hydropower station ______________ in the North of the country next year.

A. will be built B. were built C. was built D. has been built