I take 26-3The adverb well is correct. It modifies the verb have done. The adverb beautifully is correct. It modifies the verb thrive. When a word is longer than two syllables, using the -est ending is nonstandard. Because the verb feel is a linking verb in this sentence, the adjective bad is correct. The adverb professionally is correct. An adverb should be used to modify a verb such as could have been handled. The superlative form, easiest, should be used to compare more than two things. The word hardly is considered a negative, so the expression can't hardly is a double negative. The adverb incorrectly is correct. An adverb should be used to modify a verb such as cut.  Because of the helping verb have, the past participle sworn is required. The past-tense form swore is never used with a helping verb. The past-tense form cost is required.