45．A．I          B．she         C．we            D．they

44．A．beat       B．teach       C．punish         D．understand

43．A．Although    B．Since      C．Until           D．Before

42．A．opened     B．colored     C．showed        D．collected

41．A．clearly      B．slowly     C．differently       D．carefully

40．A．write           B．read          C．recite            D．draw

39．A．find out         B．talk about     C．think about        D．pay attention to

38．A．should          B．may          C．can              D．must

37．A．surprise         B．doubt         C．fear             D．joy

36．A．step            B．floor          C．chair            D．paper