Fill the gaps with the correct tenses (active or passive voice).

1.   In the year 122 AD, the Roman Emperor Hadrian (visit)  his provinces in Britain.

2.    On his visit, the Roman soldiers (tell)  him that Pictish tribes from Britain's north (attack)  them.

3.    So Hadrian (give)  the order to build a protective wall across one of the narrowest parts of the country.

4.    After 6 years of hard work, the Wall (finish)  in 128.

5.    It (be)  117 kilometres long and about 4 metres high.

6.    The Wall (guard)  by 15,000 Roman soldiers.

7.    Every 8 kilometres there (be)  a large fort in which up to 1,000 soldiers (find)  shelter.

8.    The soldiers (watch)  over the frontier to the north and (check)  the people who (want)  to enter or leave Roman Britain.

9.    In order to pass through the Wall, people (must go)  to one of the small forts that (serve)  as gateways.

10.  Those forts (call)  milecastles because the distance from one fort to another (be)  one Roman mile (about 1,500 metres).

11.  Between the milecastles there (be)  two turrets from which the soldiers (guard)  the Wall.

12.  If the Wall (attack)  by enemies, the soldiers at the turrets (run)  to the nearest milecastle for help or (light)  a fire that (can / see)  by the soldiers in the milecastle.

13.  In 383 Hadrian's Wall (abandon) .

14.  Today Hadrian's Wall (be)  the most popular tourist attraction in northern England.

15.  In 1987, it (become)  a UNESCO World Heritage Site.