Complete the sentences with article where it is necessary. fill "the" or "na" 1.  kingdom consists of  britain and  ireland. 2.  ocean is very deep. 3.  sea is between  and  . 4.  is washed  arctic ocean. 5. last year i was in  and  niagara fall. 6. this winter we are going to ski in  urals. 7.  baikal is the deepest lake in the world. 8. there are many popular skiing resorts in  alps. 9.  is the highest peak on the earth. 10. some of my old friends live in  uk.