In pairs, fill in a, an or the or - where necessary. Compare your results with the other pairs. Explain your choice.
(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)... British and (9)...Ireland is divided into(11)...two coutries: (12)..Irish Republic and (13)..Northern Ireland which is part of (14) ...United Kingdom(15) ...two islands are separated by (16)..Irish Sea.