26. william (already/hear) the news when i (call) to tell him. 27. whhile emma (do) her homework, her brother (play) music loudly, and she couldn't concentrate. 28. nathan (come) across a photo of his great-grandfather as he (look) through some old things. 29. helen (be) exhausted because she (jog) for two hours.

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.