50．1eave for动身去

　　 He is leaving for Nanjing next week．

49．1earn．．．by heart背会

　　 She has learnt it by heart．

48．1ong for渴望

　　 I'm longing for a letter from him．

47．join in参加(活动)

　　 join sb．in．加入某人做事　　 。，

　　 He joined us in watering the trees．

　　 She also joined in the dancing．

46．insist on／persist in坚持

　 He insisted on／persisted in doing that．

45．inspire…with…以……激发

　 He inspired them with courage．

44．head for朝……去

　 The ship is heading for the nearest port．

43．recover from恢复

　 She has recovered from her illness．

42．reply to答复

41．quarrel over为……争吵

quarrel with同……争吵

They quarrelled over the property．

She quarrelled with her mother．