2) Were Peter and Zhankanger at the gym last Monday? Yes, they were.
3) Was Zhankanger at the park last Thursday? No, he wasn't.
4) Was Juliya at the theatre on Wednesday? Yes, she was.
5) Were Zhankanger and Juliya at the zoo on Thursday? Yes, they were.
6) Was Peter at the park on Thursday? No, he wasn't.
7) Were Juliya and Zhankanger at the theatre on Wednesday? Yes, they were.