PTE Listening
Fill in the Blanks
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 discovered that adding a small amount of to iron dramatically increases its hardness. This principle, refined over centuries, eventually led to modern steel . Today, researchers manipulate atomic structure at the to create materials that are simultaneously lightweight and remarkably strong, opening possibilities for aerospace and construction industries alike.