Sure! Here are the sentences completed with the appropriate forms of the verbs in the present simple or past simple passive:

1. Most newspapers are printed on recycled paper.
2. The Imperial Academy is considered the first university in Viet Nam.
3. Three milliliters of water are added to the mixture.
4. The letters are delivered by the postman at 8 o’clock.
5. In 2010, the 82 Doctor’s stone tablets were recognized by UNESCO as a Memory of the World.
6. Chu Van An is regarded as one of the most famous teachers of the Imperial Academy.
7. Lots of souvenirs are sold inside the Temple of Literature.