句型转换，每空一词。
These are his keys.(改一般疑问句)
_____  ______ his keys?
Those are erasers. (改为单数句)
_______ is  ________  eraser .
He’s Eric.(同义句)
__________  ________ Eric.
Your CDs are in the bookcase.（划线提问）
_______   ______ your CDs?
Mike is fine.（划线提问）
_______  ______ Mike?