Ответьте пожалуйста на вопросы, нужно правильно построить ответ:
When was the territory invaded by  the Romans? (ответ: in 43 A.D)
 What did they bring to the Celts? (ответ: roads, central heating, baths and bridges across the rivers)
How long did the Romans stay in Britain?  (любое число)

in 43 A.D the territory invaded by  the Romans

they brought to the Celts roads, central heating, baths and bridges across the rivers

the Romans stayed in Britain  for 4 weeks