помогите с предложениями что вставить артикль the или a,an : ___ Vikings were brave people who came from Scandinavia.In ___ 9 -th and 10-th centuries they travelled to many lands including __ British Isles ПОМОГИТЕ ПРОШУУ

The Vikings were brave people who came from Scandinavia.In the 9 -th and 10-th centuries they travelled to many lands including the British Isles 

a Vikings/ In a 9-th////         a british