Answer:
The answer to your question would be that the verbs that correctly complete the sentence are has been mapped and are missing.
Step-by-step explanation:
In any sentence, there should be subject verb agreement. It means that the subject and the predicate must agree in number, that is, both need to be singular or both need to be plural. In the first part of the sentence, the subject is singular most of the site, so the verb should also be singular (has been mapped). Then, in the second part of the sentence, the subject is plural. Consequently, the verb should be plural (are missing).