Mini-Exercise: Fill in with the prepositions in, on, at

1. I usually go out  weekends.

2. London is very cold  winter but warm  summer.

3. My sister works  the hospital.

4. I will travel to New York  June.

5. What are you doing  Friday?

6. John and Mary got married  1989.

Key

1. At
2. In/in
3. At
4. In
5. On
6. In