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Indicate the correct verb form to complete the sentence:

"Scientists _____ that satellite constellations can obstruct astronomical observations."

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In the context of the passage, which of the following is a phrasal verb?
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If we turn have completed into the future perfect, we will have:
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The verb phrase is preparing in the future perfect continuous is:
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The verbs in parenthesis that fill in BLANKS I and II appropriately are respectively: