As there is less and less coal and oil, scientists are exploring new ways of making use of ____ energy, such as sunlight, wind and water for power and fuel.
18.——would you like to go and see the film with me this evening? ——I am sorry, I can’t because I ________my homework.
17.——Honey, please don’t play the computer games. ——Pardon ? ——I ______ play the computer games.
16.He’ll never forget the years _______ he studied with his cousin in Oxford University.
15.The book Been There, Done That written by a Chinese American graduate is _____a real story.
14.The number of the people who joined in the journey down the Mekong River____four.