45．A．dangerous               B．harmful                  C．heavy                     D．useful

44．A．excited                   B．disappointed            C．worried                  D．pleased

43．A．putting                   B．storing                    C．cutting                    D．growing

42．A．building                 B．flat                         C．tool                        D．machine

41．A．cloud                            B．air                          C．season                    D．temperature

40．A．hides                      B．continues                C．follows                   D．stays

39．A．through                  B．over                       C．into                        D．toward

38．A．make                      B．spread                    C．produce                  D．from

37．A．them                      B．it                           C．those                      D．such

36．A．ground                   B．sky                         C．mountain                D．forest