1: as i was climbing the mountain, а: when she hit her head on a rock.
2: the girl was kayaking down the river б: they dropped their map into the river.
3: while anna was exploring the caves, в: my sister fell into the water.
4: while we were sailing to greece, г: when he saw a boat in the distance.
5: as the friends were arguing, д: when our car broke down.
6: i was cycling through the forest е: when i saw a bear behind a tree.
7: jim was swimming in the ocean ж: she lost her torch.
8: we were driving through the desert з: i met another hiker on his way down.