Question

Example: (0) traced
The beginning of postal systems can be ........ (trace) back to 2000 BCE, in Egypt.
During the sixth century BCE, the Persian Empire, under the rule of Cyrus the Great
... (use) a system of relay messengers.
In China, a postal service had been ....2.... (start) by the Chou Dynasty. It ....3
(used) ....4.... (convey) official documents. This system had relays of couriers who
....5.... (change) horses at relay posts that were 14.5 km apart. The system .....6.... (be use)
under the Han Empire from 202 BCE to 220 CE, when the Chinese ......... (encounter)
the Romans and their postal system. The Roman system, known as "curcus publicus
was the most developed system in the ancient world. Their messengers were known
....8.... (cover) a distance of almost 270 km over a day and night!
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Answer 1

Answer:

0. Traced

1. used
2. started
3. used to
4. conveyed
5. changed
6. has been used
7. encountered
8. to cover.

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