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."

3 . On a foggy Sunday morning, Amrisha Vaish was sleeping soundly at home in Arlington, Virginia. The sound that woke him at 7:15 was so loud that he assumed it came from inside his house. As he got up to _______ carefully, he heard another sound, this one coming most definitely from outside. Looking out of his bedroom window, he noticed a tree _______ in smoke about 500 yards away. A car was wrapped by smoke around the tree’s base, and its engine was on fire.

Seeing that, he immediately grabbed buckets of water and ran to the crash site. Up close, the _______ looked worse. The car was split nearly in two, and the tree was where the driver’s seat ought to have been, as if _______ there. He thought that no one could have survived this crash, and yet there was 15-year-old Quintin Thompson, still _______ with his terrified face pressed against the driver’s side window, in visible pain. Vaish tried putting out the fire with his buckets of water yet with no success. When the   _______ got into the front seats, he realized he had to get the boy out of there as soon as possible.

Instantly, Vaish tried to open the back door, but he failed. He picked up a stone beside the tree and hit the back door. This time, it _______. The back door was opened and Vaish crawled in. Thompson was struggling to get free when Vaish noticed how _______ his legs were. Using a pocketknife, Vaish sawed through Thompson’s seat belt. Now that Thompson was free of restraints (束缚), Vaish pulled him out of a window, and then dragged him to safety before the car was _______ surrounded by flames. Vaish called an ambulance as Thompson suffered severely. Soon, the doctors arrived and Vaish felt ________.