2 . Colleen and her husband were part of a group walking the Overland Track. It was the fifth day of a 6-day walk. The guide, who was waiting for them at the nearest camp, had _______ them about the slippery and potentially dangerous conditions. Colleen, an experienced adventurer from Sydney, was a naturally _______ walker. She walked in front of her husband and carefully checked the safety of the track when they were going down a steep slope (陡坡). Suddenly she heard a cracking sound from _______.

"When I realized what was happening, I was heading to a deep ditch (沟壑), my pack on my back." Colleen's fall was only _______by the presence of a branch that stretched across the ditch and kept her from a fall that could otherwise have been deadly.

Colleen hit her head badly and went into _______. She soon woke up and turned around to see her husband sitting stunned on the side of the track. He had accidently fallen from the top. He had first slipped above Colleen, and his full weight, with his pack, _______down on top of her. He was uninjured, and Colleen was suspended on the branch. He reached out to grab Colleen's arm. Colleen felt so painful, the worst physical suffering she had ever felt in her life. She knew _______that her arm was broken.

Her husband took her pack along with his own and together they struggled for the final three kilometers to the camp. Once they reached the camp, the guide gave her first aid and called for the rescue helicopter immediately.

Colleen was _______to the nearest hospital by helicopter. She was examined in the hospital and was told that her head and neck were okay, but her arm had been broken in four places.

Later, Colleen recalled with emotion, "After this personal experience of near-death and being saved, I realized that in some situations there's absolutely no _______to get to hospital, and the rescue helicopter was the only way. At that moment, the most ________ noise was hearing the helicopter come. The helicopter rescue workers were so generous, so highly skilled as well. When they arrived with the policemen, I was never more grateful to see anyone in my whole life."