6 Underline the correct words in the brackets: (1) Goods sold to other countries.such as food, cars machines, medi- cines, books, musical instruments , cassettes, discs and many oth- ers, are (visible,invisible) exports. (2) Services, such as insurance, freight,tourism, technical expertise, medical operations and others sold to other countries are invisible (imports, exports). (3) The difference between total earnings of a country and its total expenditure is called its balance of (payments, trade). (4) The difference between a country's earnings for its visible exports and expenditure for its visible imports is called its balance of (pav ments, trade). (5) The difference between a country's GNP and its total expenditure is called its balance of (payments, trade). (6) The total amount of money a country earns including exports,for a certain period of time, is called (GDP GNP). (7) The amount of money a country earns for goods and services in- side the country is called (GDP, GNP). (8) If a country sells more goods than it buys it will have a (deficit, surplus).