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Actually, it should be "zawjuki" as Reem is female. "-ki" = you (2nd-person feminine singular), "-ka" = you (2nd-person masculine singular).
In the nominative case, "zawjuki" is standard (which is also used in Quraanic version) while "zawjik" is a local dialect from some countries.
Nb: As the course title is "Arabic" (and not "dialect"), it should follow the Standard. We know that all schools that teach Arabic use the Standard as its main source.