Замените существительное с предлогом of существительными в притяжательном падеже
The letter of Pete, the theatres of Moscow, the questions of my son, the wife of my brother, a meeting of students, the address of my fiend, the flat of my sister.

Pete's letter, Moscow's theatres, my son's questions, my brother's wife, students' meeting, my friend's address, my sister's flat