根据首字母提示填入所缺单词,使前后两词成为对应词或反义词,并使句子意思正确．
F_is at home,but m_isn't in.
The m_and the w_are my father's friends.
My ball is b_,but your ball is s_.
Tom is f_,but Nancy is t.
His s_is a student,and his b_is a worker.