Answer:
Prepare to go on stage <u>once I tell you when the best time is.</u>
Explanation:
An adverb clause is a group of related words that have at least a subject and a verb, and whose function is to act as an adverb, that is to say, to modify or add detail to adjectives, verbs or other adverbs. This type of clauses often answers questions such as "Why?", "How?", "When?", "Where?" and "In what circumstances?".
In the provided sentence, the adverb clause is "once I tell you when the best time is" as it modifies the main action "to prepare to go on stage", and answers the question "When should you prepare to go on stage?".
Sovereignty refers to the right that confers the authority to rule over a certain territory.
The question refers to France, which has sovereignty to rule in their department in South America, know as the French Guiana, which is a region of France and therefore part of the European Union. Since the independence of Belice in 1981, this is the only mainland American territory which is still part of a European country.