Opening adverbs are provided in this article. The words listed here are commonly found along with the verb opening in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb OPENING.
actually, alternately, barely, carefully, cautiously, constantly
continually, directly, eventually, finally, fully, gently
gradually, immediately, merely, occasionally, officially, partially
quickly, quietly, rapidly, really, simply, simultaneously
slightly, slowly, softly, suddenly, usually, widely
Hope this word list had the opening adverb you were looking for. In addition to adverbs used with opening, other example verb adverb pairings can be found on this site.
You can help by adding more adverbs in the comments. Thanks.