Choose the correct answer to each of the following questions. Write your answer (A, B, C, or D) on your answer sheet. Question 13: Friends of the Earth is concerned about the ______ of the natural environment. A. conservative B. conserve C. conservational D. conservation Question 14: Math and Literature are two of the ______ subjects in most examinations in Vietnam. A. additional B. selective C. compulsory D. optional Question 15: If I were a millionaire, I ______ a school for poor children. A. build B. will build C. would building D. would build Question 16: Auld Lang Syne is a song ______ is sung on New Year’s Eve in Britain. A. who B. whom C. which D. it Question 17: Scientists are looking for ______ ways to reduce energy consumption. A. effectively B. effect C. effective D. effectiveness Question 18: This school bus always comes ______ 6 o’clock ______ the morning. A. at/ in B. in/ in C. on/ in D. to/ on Question 19: Son Dong cave is recognized as ______ cave in the world by British Cave Research Association. A. the largest B. the larger than C. the most large D. the large