Translation of "Which?-" into Portuguese

Phrases similar to "Which?-" with translations into Portuguese

• speaking of which
  por falar nisso
• which way
  aonde · onde · para onde
• which one
  qual deles
• which day
  que dia
• which plane did he arrive on?
  em que avião ele veio?
• that which
  aquele que
• which do you like most?
  qual você gosta mais?
• the book which I read
  o livro que eu li