UNIT II (i) Of course, modern postal services now are much more sophisticated and faster, relying as they do on motor vehicles and planes for delivery. (ii) Indeed, the ancient Egyptians had a system for sending letters from about 2000 BC, as did the Zhou dynasty in China a thousand years later. (iii) Letters, were, and are, sent by some form of postal service, the history of which goes back a long way. (iv) For centuries, the only form of written correspondence was the letter. The best sequence is: