6. Mai __________ about types of energy sources now.
A. talks B. is talking C. talking
7. We __________ solar energy to replace energy from coal today.
A. are using B. is using C. using
8. Keep quiet! The students of Class 8A _________ a test.
A. taking B. is taking C. are taking
9. Scientists ____________new energy sources to protect the environmen
A. are developing B. is developing C. develop
10. We ____________ the use of nuclear energy nowadays.
A. reducing B. are reducing C. is reducing
