问题补充：
--- Tom, where is your father? --- I’m not sure. He in his office.
A. is
B. may be
C. maybe
D. may
答案：
A. is
(答案→)B. may be
C. maybe
D. may
解析：is系动词，是；may be可能是；maybe副词，也许，可能；may情态动词，可以，可能。句意：汤姆，你的父亲在哪儿？——我不确定。他可能在办公室。结合语境可知下文中缺少谓语动词，故选Ｂ。
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