Q31. Updated reading and writing fill in the blanks

Reading and Writing fill in the blanks practice exercise. Below is text with blanks. Choose the correct word for each blank to complete the text.  

Arguably the greatest mystery facing humanity today is the prospect that 75% of the universe is made up of a (1…………..) known as “dark energy”, about which we have almost no knowledge at all. Since a further 21% of the universe is made from invisible “dark matter” that can only be (2……………) through its gravitational effects, the ordinary matter and energy making up the Earth, planets and stars is apparently only a tiny part of what exists. These (3………………) require a shift in our perception as great as that made after Copernicus’s (4……………) that the Earth moves around the Sun.

1. substance, fabric, material, matter

2.detectd, found, identified, observed
3.inventions, findings, detection, discoveries
4.revelation, announcement, publication, exhibition 

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