Is there a program that I can get for free that will make professional sounding beats? I am saving up to get something like Fruity Loops (FL Studio) but for right now I dont know what else I can do. Any tips or help?

4 sience my teacher said if we make up a rap we would get 5pts extra on an upcoming test I’m having! My problem is I don’t know how to make one. If u could help that would be awsome! I have to use thes 21 words in my rap. (I dont have to give all the defines…but the words must be there! PLEASE HELP!!!
-portable-safe to drink
-pathogen-organisms that cause illness or diseases
-irrigation-method of providing plants w/ water from sources other than direct precipation
-dam-structure built across a river to control a river’s flow
-reservoir-water from a reservior
-desalination-process of removing salt from salt water
-waterpollution-added to water that degrade in the water
-point-source pollution-pollution from single source
-non-source pollution-from many differnt sources
-wastewater-water that contains waste
-artifical eutrophication-caused by fertilizers+humans
-thermal pollution-when temp. of water increases causes cooling polltion
-biomagnififaction- accumolation of pollution at succesive reveals food chain
- surfacewater-water on top of earth
-riversystem-all streams and channels draining a river basin
-watershed-amount of water thjat comes off river
-groundwater-borrow below earth
-aquifer-underground layer of eartth
porosity-able to absorb water
-permeability-able to permetrate by liquid
-recharge zone-area where aquifer recharges
Thanks to all the people that help!!!
Thanks to all the people that help!!!
Thank u slomotion!!!