1725. What character can be added to both of these characters to give other characters? 任_ -> _武

Answer:

任  NIN, maka(seru) - entrust, responsibility

武  MU, BU - military

Add 貝:任+貝 貝+武 

貝  KAI - shellfish

賃  CHIN - rent, wages, fee

賦  FU - tribute, payment, installment