求求求
____they your brothers?A.Is   B.Are   C.Am   D.Be
Is this your brother?No,___.It is my friend.A.it is   B.he is not   C.he isn't    D.it isn't
Is the little boy____(jim)brother?用括号内所给的词的适当形式填空
That's Lily and that's Lucy.They are_____(sister)