根据答语，选择问句。(20分)
________（1）No, she isn't.
________（2）I learned how to use reference books in the library.
________（3）It's fine today.
________（4）He begins to study at seven in the evening.
________（5）I would like a glass of apple juice.
I really don't know________．
A．what to do it B．where to do C．what to do
He's busy________ English.
A．learn B．learning C．to learn
Why________read books?
A．not to B．don't C．not
Teachers taught us________many ways.
A．in B．at C．from
