Explanation:
The adverb 'completely' is placed between the auxiliary verb 'have' and the main verb 'understood', which is the standard mid-position for adverbs modifying verbs.
Explanation:
'Efficiently' is an adverb correctly modifying the verb 'performed'. In the other options, adjectives are wrongly used instead of adverbs (e.g., 'looks beautiful' is correct, not 'looks beautifully' when referring to appearance).
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