Ответ:
2.Jim and Mark have ridden a horse
3.Eva hasn't seen a dolphin
4.Mark and Jim have eaten a Japanese food
5.Jim hasn't been to New York
6. Mark and Eva haven't seen a dolphin
номер 2
2. have Mark and Jim ridden a horse?-- yes,they have
3.has Eva ridden a horse? - No,she hasn't
4.has Mark eaten a Japanese food? -- yes ,he has
5.has Jim been to New York? -- No,he hasn't
6.has Eva eaten a Japanese food? -- No,she hasn't
7.has Eva been to New York? -- Yes,she has