Here are the sentences with the correct prepositions filled in:

1. Ahmet's grandmother died **in** 1990 **at** the age of 81.
2. Were there many people **at** the concert?
3. He speaks quite good French. He studied **in** Paris for a year.
4. She passed her driving test **in** March.
5. Valencia is too hot for me **in** summer.
6. **On** Sunday mornings I have coffee and toast for breakfast and read the newspaper.