Choose he right answer.Sometimes you need the,sometimes not. 1)Of which country is london the capital?(gr.britain,France,USA)

1) London is the capital of Great Britain. 2) Africa is the largest continent. 3) Edinburgh is the capital of Scotland. 4) London stands on the river Thames. 5) The name of the sea between Britain and Norway is the North Sea. 6) Washington is the capital of the USA.