13 Insert the correct prepositions: (1) In the 19^th century Britain accounted __ about one third __ world's exports. (2)Foreign trade is vital __ Britain. (3) The country depends __ foreign trade. (4) There is usually an unfavourable balance __ trade in the country. (5) But this is compensated __ by the so -called invisible trade. (6) The earnings __ invisible trade come in various payments.

(1) In the century Britain accounted for about one third of the world's exports.(2) Foreign trade is vital to Britain.(3) The country depends on foreign trade.(4) There is usually an unfavourable balance of trade in the country.(5) But this is compensated by the so-called invisible trade.(6) The earnings from invisible trade come in various payments.