III. Choose the best answer (A, B, C, or D) to complete the sentences. 1. We are looking for cheap, clean, ……….. sources of energy. A. polluting B. harmful C. expensive D. effective 2. We should try to reduce energy ……….. as much as possible. A. production B. producers C. consumption D. consumers 3. Sources of energy will be used more ……….. for our future. A. effective B. efficient C. effectively D. efficiently 4. A sky safety system will stop everyone ……….. crashing in the sky. A. at B. from C. through D. for 5. We can ……….. the problem of energy shortage by using solar energy. A. carry out B. get C. recover D. solve 6. Is this schoolbag ……….. ? A. you B. your C. yours D. them 7. The city is working on a project ……….. the slums with clean water. A. providing B. provide C. to provide D. to providing 8. Is that country, over 30% of the population live in ……….. . A. poor B. poorer C. poverty D. the poor 9. There are more problems in the slums than in the ……….. areas. A. wealth B. richness C. wealthy D. country 10. ……….. is quite popular in an overcrowded city where you can see people sleeping in a park or under a bridge. A. Homeless B. The homeless C. Homelessly D. Homelessness