(i) During his stay he received an unpaid letter from his friend, which contained nothing but some words. (ii) With a great hope in mind, he opened the box. (iii) He wanted to teach his friend a good lesson. (iv) An English poet was staying in Italy for the benefit of his health. (v) To his utter surprise, he found nothing but an ordinary stone. (vi) Thus the poet taught his friend a good lesson. (vii) So, he procured a heavy stone and packed it up in a fine box. (viii) His friend thought that the contents of the parcel were valuable, so, he paid the heavy charge for carrying. (ix) The poet had to pay double postage, so, he became very annoyed. (x) Then he sent it to his friend with the words on it “Carriage to be paid on delivery.