单项选择题 The foundations of（）was laid in the late 1940s,providing free medical care for everyone and financial help for the old,the sick and the unemployed.

单项选择题 The Blitz radically changed the face of London for the first time since（）nearly 3 centuries earlier.

单项选择题 After World War I political unrest in Britain led to（）general elections in just over 5 years.