Which element is necessary to complete the sentence above

Without having the sentence here, I can only help you to work through each part.  Is there a subject?  What is the sentence about or who is doing the action?  Is there a verb?  What is the action of the sentence?  For example, The dog ran.  You can ONLY have a complete sentence if there is a subject and a verb (or predicate).  The dog is the subject, ran is the verb/predicate.  Don't forget the imperative sentences, which are commands, and 'you' is the subject. For example, wash the dishes.  The verb is wash.  Who is doing the washing?  You.

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umm of course in fact ur getting your answer : )