ключ, основний, ключовий

Приклади використання слова «key»:

I believe this place to hold the key to thewhole mystery, I believe .
Cautiously she turnedthe pantry key from inside.
Pausing at a door, the cleaning woman fitted a master key into the lock.
Deline glanced curiously at the key ring on the dresser.
You will find the key of the tower in his belt.