15. A. shout                           B. could                     C. house                     D. down 16. A. happen                        B. family                    C. father                     D. rapid 17. A. dream                         B. teacher                  C. stream                   D. bread 18. A. drunk                          B. drug                       C. fruit                        D. unhappy 19. A. changes                      B. causes                    C. noises                    D. makes 20. A. smile                           B. finish                     C. kitchen                  D. miss