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.
The rest of the universe appears to be made of a mysterious, invisible (1……………..) called dark matter and a force that (2……………) gravity known as dark energy. Scientists have not yet (3……………….) dark matter directly. It doesn’t interact with baryonic matter, and it’s completely invisible to light and other forms of electromagnetic radiation, making dark matter impossible to detect with current instruments. But scientists are confident it exists because of the (4……………..) effects it appears to have on galaxies and galaxy (5………………).
1. Substance, material, property, subject
2. Repels, beats, gathers, fights against
3. Looked, tested, smelled, observed
4. Gravity, gravitational, constitutional, national
5. Balls, flocks, clusters, bunches
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