A. algae B. aquatic C. contaminate D. permanent 2. A. thermal through B. thankful C. there D. through 3. A. untreated B. measure C. pleasure D. bread 4. A. phoned B. stated C. mended D. old-aged 5. A. nations B. speakers C. languages D. minds 6. A. ideal B. item C. idiom D. identical 7. A. valentine B. imagine C. magazine D. discipline 8. A. knowledge B. flower C. coward D. shower 9. A. community B. common C. command D. complete 10. A. famine B. determine C. miner D. examine 11. A. bought B. drought C. brought D. ought 12. A. geology B. psychology C. classify D. photography 13. A. bear B. beard C. wear D. prepare 14. A. looked B. suggested C. minded D. decided 15. A. says B. looks C. laughs D. wants 16. A. university B. unique C. united D. undo 17. A. faithful B. fairy C. failure D. fainted 18. A. sun B. sure C. success D. sort 19. A. airports B. signs C. things D. calculators 20. A. planned B. studied C. communicated D. exchanged