Multiple choice

Which of these fits gap 21?

Directions: Complete this passage by selecting the most suitable option for the corresponding gap.

There was a time when scientists were in search of what ____(21)_____ as the philosopher's stone which was believed to _____(22)_____ metals into gold just by a touch. They also tried to discover the elixir (something that can make people live for ever) of life. This was an imaginary medicine _____(23)_______ making people immortal. This period was called the _____(24)_____ of the Alchemists.

  1. is known

  2. was known

  3. knew

  4. have been known
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sentence describes past events ('was believed', 'tried to discover'). 'Was known' is correct because it matches the past tense of the passage and the passive voice construction 'what ___ as the philosopher's stone'. The other options either have wrong tense ('is known', 'have been known') or wrong form ('knew' is active voice, not passive).

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