–Do you know the boy ___ is standing under the tree?

-- Yes, he is my friend, Peter.

A. what   B. who   C. whom D. whose

根据要求变换句子，每空一词。
【小题1】Lingling said  “I am doing my homework now.”（改为间接引语）
Lingling said that she________doing her homework ______ .
【小题2】I did my homework last night.（改为一般疑问句）
________ you ________ your homework last night?
【小题3】It cost me 500 yuan to buy the digital camera.（改为同义句）
I  ________ 500 yuan ________ the digital camera
【小题4】Hurry up, or we’ll be late.（改为同义句）
______ we _______ hurry up , we’ll be late.
【小题5】Where does the boy live? Do you know?（改为宾语从句）
Do you know _________ the boy _________?

—Do you know the boy ____ is playing soccer there?
—Certainly, he is a friend of my _____

--- Do you know the boy________ is sitting next to Peter?

--- Yes. He is Peter’s friend. They are celebrating his ________ birthday.