Ответ:
1.The system of political parties in the UK appeared in the 17th century.
2.The names of the parties are Tory and Whigs
3.The British Government is represented by two political parties
4.In 1988 the Liberal Party made an alliance with Social Democrats
5.The proportional representation system in the UK means that all political parties, small and large, are represented in the government according to the proportion of votes they receive.