PTE Listening
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1 questions. Answer them all, then submit once for your section score.
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1.
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You will hear a recording. Type the missing word in each blank exactly as you hear it.
Engineers are now developing self-healing polymers that can repair microscopic cracks without external intervention. These materials contain embedded filled with a bonding agent. When a occurs, the capsules and release the agent, which hardens upon contact with air, effectively sealing the damage .