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Joy English · Level B2 · Sciencejoy-english.com

How glass is made

Name:Date:

Understand a production process with passive verbs.

Listen to each sentence and write what you hear.

Audio and answer checking: https://joy-english.com/listening-lessons/how-glass-is-made

Words to know

furnace
A very hot oven used in industry.
molten
Melted by heat.
crack
To break so that a line appears on the surface.

Answer key

  1. Glass is made mainly from sand mixed with a few other materials.The -ed of “mixed” is a t sound: “mix-twith”.
  2. The mixture is heated in a furnace until it melts.“Is heated” is a passive. “Until it” links: “un-ti-lit”.
  3. The molten glass can then be blown, pressed or rolled into shape.“Blown”, “pressed” and “rolled” are all past participles.
  4. It must be cooled slowly, or it may crack.The d of “cooled” joins “slowly”.
  5. Because it can be recycled again and again, glass is a useful material.“Again and again” means many times.

Joy English · free English practice · https://joy-english.com/listening-lessons/how-glass-is-made