Although the list of words or phrases was not provided in your question, the complete sentences would be:
The Roman arch was used for design, as in the Coliseum, but mainly for structural purposes. The arch helped support the weight of big structures like aqueducts and bridges.
During his reign, Augustus invested in public works and art, with expensive materials such as marble, as a symbol of Rome's greatness.
With the help and patron of his friend Marcus Agrippa, Augustus drained the swamp in the area of the Field of Mars. They built on it a complex of great marble buildings such as temples, baths, gymnasiums, and an aqueduct. The most relevant building done at the time was the Pantheon.
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