Asking About Location in Serbian

Fourteen years ago on March, 13th 1996, this song was the Song of the Day at the local radio station. I remember listening to it every hour! Take a guess where I was by asking questions, as follows:

1. "Da li ste bili u + city ? "
(when you guess the name of the city, proceed to 2)
2. "Da li ste bili u + place ?"

1/Word Bank: ---> Locative Case

Bečej ----> Bečeju
Senta ----> Senti
Zrenjanin ---> Zrenjaninu
Novi Sad---> Novom Sadu
Šabac ---> Šapcu
Niš ---> Nišu
Kragujevac ---> Kragujevcu
now, you do the same...
Kraljevo --->
Milanovac --->
Paraćin--->
Subotica --->
Zaječar--->
Beograd --->

2/Word Bank for places ---> Locative

škola - školi
crkva - crkvi
centar - centru
važno mesto - važnom mestu
*now, you do the same...
zgrada
vrtić
prodavnica
sajam
knjižara
bolnica