语法填空（15分）
“Put yourself in someone else’s shoes” is ___16___ idiom that means if you imagine yourself to be in another person’s position, good or bad, you may understand how they feel, good or bad, or why they have done ___17___ they’ve done.
This idiom comes from the fact ___18___ a pair of perfectly fitting shoes for someone may not fit another person as perfectly. So, literally, only if you put ___19___ another person’s shoes can you feel how it is to walk in___20___.