The two spies had to have so they could communicate to one another during the government mission A. expatriate
B. auditions
C. paternal
D. allases

Aliases

Explanation:

An alias is a fake or presumed identity. Seeing as how they are spies, they would have to presume an identity other than their own to be able to communicate during this mission.

comfort   in their suffering

specific audience will understand the main ideas. for example, if you were writing an instruction manual for rocket scientists, it would likely look very different from one you would write for young children. your language, tone, and writing style would change significantly.