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