18. A) They make decisions by tossing coins. B) They are not physically separated. C) They think exactly the same way. D) They share most of their vital organs. 19. A) Few of them can live long. B) Few of them get along well with each other. C) Most of them live a normal life. D) Most of them differ in their likes and dislikes. 20. A) They go to a regular school. B) They attend a special school. C) They are taught by their parents. D) They have a private tutor.