Przeczytaj tekst. Dobierz właściwy nagłówek do każdej części tekstu. Dwa nagłówki zostały podane dodatkowo.

A. WHAT IS THE PROBLEM WITH READING LETTERS FROM THE PAST?
B. HOW CAN THE LOCKED LETTERS BE READ AT PRESENT?
C. HOW EXACTLY WERE THE LETTERS USUALLY LOCKED IN THE PAST?
D. WHO WAS THE PERSON THAT INVENTED LETTER LOCKING?
E. WHY DID PEOPLE HAVE TO STOP LOCKING LETTERS?
F. WHAT IS MEANT BY LETTER LOCKING?

LETTER-LOCKING

1. These days, there are many ways of sending secret messages. (...)

(Cała treść tekstu, z dopasowanymi nagłówkami, została skopiowana do odpowiedzi.)