Заполните пропуски подходящими прeдлогами at, on, in.

Пример: Where is your bag? It is ... my car. - Where is your bag? It is in my car.

1. There were a lot of interesting people ... the party.
2. My mother works .... the university.
3. I left my keys ... the bedstand.
4. These butterflies were grown ... Africa.
5. My friend lives ... the first floor