Очень Безотлагательно ( без перевод а) только 5 вопрос

1. Did they see the sign "Nothing to declare" and the green walls of the passage?

2. Who saw the sign....?

3. What did they see?

4. They saw the sign "Nothing to declare" and the green walls of the passage, didn't they?

5. Did they see the sign "Nothing to declare" and the green walls of the passage or the sign "Goods to declare"?