Complete the gapped text using Passive Voice (Simple Present or Simple Past).

Source: wikipedia.org

The Taj Mahal (1) ... (build) in 1631 by Shah Jahan. He dedicated it to his wife, who had died. A thousand elephants (2) ... (use) to carry the materials that (3) ... (need) to complete the building. To this day, the Taj Mahal (4) ... (consider) to be one of the most beautiful buildings in the world.

What is the most suitable word for point 1?