Ответ:
25 Linda had been trying to find a present for her mum for over an hour before she finally saw something nice to buy her.
26 William had already heard the news when I called to tell him.
27 While Emma was doing her homework, her brother was playing music loudly, and she couldn't concentrate.
28 Nathan came across a photo of his great-grandfather as he was looking through some old things.
29 Helen was exhausted because she had been jogging for two hours.
