Identify the participial phrase in each of the following sentences:
1. Having been on the road for four days, the Todds were exhausted.
2. That hymn, sung by many generations of churchgoers, is my favorite.
3. Climbing slowly, we approached the top of the hill.
4. Surprised by my question, Mrs. Osmond blushed.
5. Phil, worn out by his long trip, slept for twelve hours.
6. Watching me closely, the dog came toward me.
7. Staring out the window at the rain, Bob became more and more impatient.
8. Having been hurt in the first game, Al sat on the bench for the rest of the season.