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Краткий ответ — вопросы по порядку:

1. Where was Sam yesterday? — He was at the sports centre.
2. Where was May? — She was at the café.
3. Where were Jill and her mum? — They were at the zoo.
4. Was Miss Sun at the hospital? — No, she was at the school.
5. Where was Sue? — She was in the sports field.
6. Was Pex watching a DVD? — No, he was in a tree.
7. Were Bill and Max at the sports centre? — No, they were in the park.

Как понять принцип:

• В прошедшем времени was ставим с одним человеком/животным: Sam, May, Miss Sun, Sue, Pex.
• were ставим с несколькими: Jill and her mum, Bill and Max.
• Если ответ начинается с места — задаём вопрос со словом Where:
  Where + was/were + кто?
• Если ответ начинается с No, значит вопрос общий, и was/were ставим в начало:
  Was Miss Sun at the hospital?

Проверка: каждая картинка совпадает с местом из ответа: спортцентр, кафе, зоопарк, школа, спортполе, дерево, парк. В примере есть yesterday; в остальных вопросах его можно не повторять — контекст уже понятен из задания.