A. after B. contribute C. valid D. arrowhead A. quack B. before C. expose D. building A. solitary B. defeat C. in favour of D. sugar A. fragrant B. responsible C. the Palace Museum D. out of sight A. put forward B. recur C. designer D. flashlight A. perch B. sketch C. germ D. slight A. workplace B. pollute C. southern D. fasten A. disaster B. frozen C. in peace D. construct A. remains B. cricket C. attend D. congratulate A. gunpowder B. firework C. pleasant D. dreary