You are going to read a text on astronomy. Choose a word from the list to complete each gap (1-10). Change its form where necessary to make a word/a group of words that fits in the gap. Use each word only once.

Different aspects of form change are possible:
active or passive voice; indicative, imperative or subjunctive mood; finite or non-finite forms (infinitive, gerund, participle); tense for finite forms or aspect for non-finite forms; full or bare infinitive, etc.

allow
bring
come
emit
go
observe
orbit
produce
provide
understand
Early people believed all objects 1in the skies 2the Earth.
Progressively, scientific observations proved that Earth and other planets 3around the Sun.
The invention of the telescope around 1609 enabled scientists 4evidence of this hypothesis and 5the discovery of many more space objects.
From the 1930s, astronomers 6that some space objects 7invisible radio waves, as well as or instead of light rays.
Radio telescopes 8about discovery of yet more objects in space, many invisible to ordinary optical telescopes, because they 9 no light. More kinds of rays were discovered 10from space objects.

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