Complete the sentences with in, at or on.
1 We often have picnics__spring.
2 I have a judo competition__the weekend.
3 My brother goes jogging__the morning
4 Children celebrate Halloween__31st October
5 I never study__night. I'm too tired.
6 It's my grandmother's 80th birthday March.
7 People light candles__Christmas and Diwali.
