The probe usually ___ defects in the material., detects, is detecting, Look! The engineer ___ the sample now., measures, is measuring, Water ___ through the crack at the moment., leaves, is leaving, This equipment often ___ high-frequency waves., uses, is using, The speaker cone ___ back and forth now., is moving, moves, Sound usually ___ through a solid faster than through air., is travelling, travels, The technician ___ the surface for flaws right now., is checking, checks, Magnetic particles often ___ imperfections clearly., are revealing, reveal, At the moment, the transducer ___ energy into the material., transfers, is transferring, A wave ___ when there is a disturbance., propagates, is propagating, Be quiet! The students ___ out the explanation., are figuring out, figure out, This method ___ on the density of the substance., is depending, depends, The liquid penetrant ___ into the crack now., is going, goes, Ultrasonic testing often ___ internal flaws., is finding, finds, Right now, the device ___ the distance accurately., is measuring, measures, X-rays ___ through some solid materials., are passing, pass, The current ___ in alternating directions now., flows, is flowing, A carbon sample usually ___ some energy., absorbs, is absorbing, Watch carefully! The wave ___ from the boundary., is reflecting, reflects, The inspector often ___ defects with a naked eye., is noticing, notices

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