its    hardly    support    long    season

46．A true friend always 　　 you whenever you are in trouble．

47．Steve seemed so interested in drawing that he 　　 got tired of it．

48．Many people rushed to Tiantai Mountain at the height of this tourist 　　．

49．The nice little dog waved 　　 tail happily，welcoming the owner back home．

50．China is over 5,000 years old which has a much 　　 history than the US．