Prepositional phrase exercise

Prepositional phrase exercise. Choose the right prepositions in or at to complete the following sentences in English.
1 'Where's Tina?' 'She's work.'
2 Why didn't the bus-driver stop the bus-stop?
3 Go straight on the roundabout and turn right the church.
4 There was a big table the middle of the room.
5 What is the longest river the world?
6 Were there many people the concert on Friday?
7 My brother is studying mathematics London University.
8 'Where does your sister live?' ' Brussels.'
9 Did you read about the accident the newspaper?
10 Will you be home tomorrow afternoon?