Question

choose the word or phrase that best completes each sentence. caesar augustus made sure that the central government controlled tax collection. engineers built the field of mars, which had government offices and statues. a mail service was created to improve communication. caesar augustus ordered the construction of, which improved water supplies and provided water for crops. aqueducts temples water towers

Explanation:

To solve this, we analyze the context: the sentence is about improving water supplies and providing water for crops. Aqueducts were Roman structures built to transport water, temples are for religious purposes, and water towers are a more modern concept. So aqueducts fit the context.

Answer:

aqueducts