Multiple choice

Directions: Select the best option to fill up the blank.

Glass that has been tempered may be up to ____.

  1. five times as hard as ordinary glass

  2. as hard as ordinary glass five times

  3. hard as ordinary glass times five

  4. ordinary glass as hard as five times
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

five times as hard as ordinary glass

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