【正确答案】 The Roman occupation of Britain lasted from 43 AD to 407, during which period Britain was ruled as a province of Rome. The Roman influence was so great that there was not the slightest evidence that any national feeling existed. ①They brought Christianity to England. ②They brought swords to England and built great walls, baths, temples, beautiful villas and fine buildings. They drained marshes, cleared away forests, built roads and taught the Britons to cultivate their land in a better way. ③They introduced a system of organized government and built a network of walled towns. ④The English upper classes became completely Romanized and were transformed from Celtic tribal chiefs into Roman landowners and officials.