... three hundred (15 ) _ fifity kilometers Nam : Do you sometimes visit your uncles and aunts (16 ) _ your summer vacation? Mai : ( 17 ) _, I And I go there ( 18 ) _ coach Nam : How (19 ) _long ... (10 ) _ stamps Nam : Do you (11 ) _ post a letter to a friend? Mai : No, I want to (12 ) _ some letters to my uncles and aunts (13 ) _ Da Lat Nam : How (14 ) _ is it from Da Lat to our ... But you want (7) _ post a letter, Nam? Nam : Yes, I want to post a letter (8) _ my pen friend in Great Britain Mai : Well, let’s go (9) _ I also want to buy some envelopes (10 ) _ stamps...