A. How old are you, Kim? B. Nice to meet you too. C. Bob, this is my brother, Kim.
pen(变一个字母,成为一种数字)
too(变一个字母,成为一种数字)
fine(变一个字母,成为一种数字)
sit(变一个字母,成为一种数字)
it's(完全形式)
what's(完全形式)