58.　 how→ on how 　

57.　 oneself→ himself 　

56.　 she’s→ though she’ 　

55.　 drop “monitor”

54.　 drop “to”　

53.　 to→ for 　

52.　 catch→ can catch 　

51.　 which→ that 　

50.　 have→ has

49.　 has→ have