Here are the completed sentences using the Present Perfect tense:
A:
B:
Explanation: The Present Perfect tense is used for actions that happened at an unspecified time in the past or actions that started in the past and continue to the present. We use 'has' for third-person singular subjects (he, she, it, Mary, Mr. Smith) and 'have' for other subjects (I, we, they, Pat and Sue).