Exercise 3: Fill in the blank with a correct preposition.
1. I last saw him _________ last March.
2. Section 5 is _________ the first floor of the Prep School.
3. You mustn't smoke _________ a bus.
4. Ahmet's grandmother died _________ 1990 _________ the age of 81.
5. Were there many people _________ the concert?
6. He speaks quite good French. He studied _________ Paris for a year.