The blue jeans _______ 50 dollars. And that black pair of jeans _______ 60 dollars.
--What are these? --_______ books.
如果你想知道对方姓什么时,你应该问_____________________________
_______ are my brother and sister.
His name is David Brown.His family name is ________.
--What’s your brother’s name? --_____ name is Dave.