Six men have been trapped in a mine for seventeen hours. If they are not brought to the surface soon they may lose their_____小题1:____ (life). However, rescue operations are _____小题2:____ (prove) difficult. If explosives are used, vibrations will cause the roof of the mine ____小题3:_____ (collapse). Rescue workers are therefore drilling a hole on the north side of the mine. They intend to bring the men up in    小题4:   special capsule.     小题5:    there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours. As it is, they have been drilling for sixteen hours and they still have a long way to go. Meanwhile, a microphone, which   小题6:  (low) into the mine two hours ago, has enabled the men to keep in touch with the closest relatives. Though they are running out of food    小题7:     drink, the men are     小题8:  (cheer) and confident that they will get out soon. They have been told that rescue operations are progressing     小题9:   (smooth). If they knew how difficult it was to drill      小题10:   the hard rock, they would lose heart.