would you please help me draw these structures? thks

Draw the structure for each of the following compounds a) 4-ethyl-2,5,6-trimethyl-3-nitroheptane b) 2-bromo-1,1-diethylcyclopropane c) 3,4-dichloro-1-isopropylcyclopentane d) 1-bromo-3-t-butyl-3-ethyl-1-nitrocyclobutane