please help

we were given the "mission impossible" theme first in 5/4 and then in 10/8 and then again in 5/4.. the assignment is to write 2 other parts, one of them should substitute the meter through pitch accents and the other can be anything other than playing against the meter.. i've very confused how to accomplish this..

in the second assignment we were provided a 4 bar ground bass in D minor, the first 2 times through all ground bass tones have to be a tetrian triad chord tones, the 3rd and 4th time through every other ground bass tone has to be a tetrian triad chord tone.. we have to add 2 parts to complete the harmonies.. if anyone could please explain this to a newbie it would be very helpful, thank you