To use "would be" you should rephrase the sentence as such:- I have called Miki and her family several times. Since no one answered, it would be likely they are out of town. In my opinion, the simplest way to use "would" would be the past tense of "will".
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AnonymousMiki and her family ( ) out of town. I have called several times, but there is no answer.The second sentence is not there just for decoration. You have to relate the second sentence (underlined) to the sentence with the blank.
AnonymousIn Japan, students have to pass entrance examinations which ... My job is to help such students.Ah, I see. Well, be sure to remind them that in multiple choice exams there may be more than one correct answer among the choices, and the student has to choose the best answer, not just any correct answer. The best answer is the one that is not