Помогите пожалуйста написать 7 предложений с предлогами of и since. Пж пж пж.

A den of a bear,a dog of ours,one of my friends,a jar of water,take the ball out of the pit,this is the dictionary of our teacher,such huts are made of clay.(предлог of).lt has rained since morning,since when did you become a doctor?,l am retired since July,l have worked there since 2005,l have not seen you since college,lt has been ln London since Monday,he has been ln England since March(предлог since)