41. She sings and dances __________________________ A. beauty B. beautiful C. beautifully D. beautify 42. He is an enthusiastic ___________ in that city. A. conservationist B. conservatively C. conserve D. conservative 43. The inhabitants have made _________________ on how to protect the environment. A. suggestions B. suggestive C. suggest D. suggestively 44. The consumers want the products that not only work ___________, but also save money. A. effectiveness B. effect C. effective D. effectively 45. The streets of the city were filled with __________________ crowds celebrating the New Year. A. enjoy B. joyful C. joyfully D. joy 46. Lighting _______________ for 10 percent to 15 percent of electricity bill in most households. A. accountably B. account C. accounts D. accountable 47. They worry about the _______________ effect that violent films may have on children. A. destructive B. destroy C. destruction D. destructively 48. Many houses in European countries will be __________ by solar energy in the future. A. hot B. heated C. heat D. heating 49. Passover, the “festival of_____________________”, is celebrated by Jewish people. A. free B. frees C. freely D. freedom 50. Use public transport or we won’t______________________ pollution. A. minimum B. minimize C. minimization D. minute