Choose the correct word to fill the blank. Orders for his arrest were issued by the ____________ court.

Solution:

Imperial is the right answer because it means "related to an empire or royal or regal." The given sentence refers to the court that operated under the laws of an empire, and the word 'imperial' adds significance to the sentence: "Orders for his arrest were issued by the imperial court."
Imperious is an incorrect answer because the definition of "imperious" is "arrogant, domineering, or high-handed." This word does not belong in the phrase since a court cannot be defined as "arrogant," and the inclusion of "imperious" makes the sentence inappropriate: "Orders for his arrest were issued by the imperious court."