1050. What character can be added to both of these characters to give other characters? 戸_ -> _却

Answer:

戸  KO, to - door

却  KYAKU - pull back, withdraw

Add 月:戸+月 月+却 

月  GETSU, GATSU, tsuki - moon, month

肩  KEN, kata - shoulder

脚  KYAKU, KYA, ashi - leg