Составить 7 предложений со словами : slate-шифер, lime-известь, stairs-ступеньки, staircase-лестница, install-установить,purchase-покупать,whitewash-белить. нужно..

The roof of our house is made of slate
the walls of the bunker were made of concrete, steel and lime
Old castle`s stairs go down in the basement
she installed a new program
the land is bought at 20 years' purchase
he whitewashed the ceiling in his new house