56．This is most probably a letter _____.

　 A．from a father to his son　　 B．from a mother to her son

　 C．from a father to his daughter　　　 D．from a mother to her daughter

46．A．rooms B．lifeboats　 C．food　 D．lifebelts

45．A．but　 B．until　 C．although　 D．and

44．A．sinking　 B．rising　 C．stopping　 D．going

43．A．delight　 B．excitement　 C．joy D．horror

42．A．everyone B．everybody C．nobody　　 D．anybody

41．A．that　 B．which　 C．what　 D．how

40．A．receive　 B．avoid　 C．fight　 D．meet

39．A．formed　 B．appeared C．seen　 D．established