句型转换。根据括号内的要求转换下列句型，每空填一词。(每空1分，共10分)
This is my pen. (一般疑问句)
_______ this ________ pen?
The backpack is under the bed（划线部分提问）.
_______  _______ the backpack？
That is my potato（变复数形式）.
________ are my __________.
Their bags are black. (对划线部分提问)
________are their bags?
Hi, I’m Jenny White. (改为同义句)
Hi, ________ ________ is Jenny White.