III.Viết lại câu sử dụng cấu trúc bị động khách quan(Rewrite the sentences using the impersonal passive)

1. It is understood that My son sanctuary was constructed between the 4th and the 14th century ad

2. It is known that citadel of the ho dynasty was the capital of viet nam from 1398 to 1407.

3. It was said that hue imperial city was the politicial cultural and religious centre under the nguyen dynasty

4. It is believed that hoi an was an active trading port from 15th to 19th century

5. It was reported that there was human activity in trang an landscape complex more than 30000 years ago

6. It was understood that the thang long imperial citadel was built in the 11th century by the vietnamese ly dynasty

7. It is known that ha long bay is a spectacular seascape of limestone pillars

8. It is hoped that the level of tourism needs to be managed so as not to exceed the capacity of hue monuments

9.It was said that thang long was the centre of religion political power for almost 13 centuries without interruption

10. It was understood that hoi an town reflects indigenous and foreign cultures