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telescope
mastery UK /ˈtɛl.ɪ.skəʊp/ US /ˈtɛl.əˌskoʊp/nounverb
card 1 of 10 · fill in the blank
Scientists spent fifteen years _____ a powerful telescope to explore distant galaxies.
card 1 of 10 · fill in the blank
Scientists spent fifteen years _____ a powerful telescope to explore distant galaxies.