Fill in a, an or the or – where necessary.
I. (1) ... British Isles are (2) ... group of (3) ... islands in (4) ... North Sea on (5) ... Atlantic coast of (6) ... Europe. (7) ... two largest islands are called (8) ... Britain and (9) ... Ireland. (10) ... Ireland is divided into (11) ... two countries: (12) ... Irish Republic and (13) ... Northern Ireland which is part of (14) ... United Kingdom. (15) ... two islands are separated by (16) ... Irish Sea.