用适当的介词完成句子
1. I have been ________ Zhongshan Park. Have you ever been there? (填介词)
2. This is a photo ________ my family. There are five people ________ it. (填介词)
3. We can skate happily ________ winter. (填介词)
4. —What do you usually do ________ weekends? (填介词)—I usually go out ________ a picnic.
5. I sometimes go to swim ________ Saturday afternoon. (填介词)
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