A、Get Dr. Black’s written permission. B、Ask Dr. Black to call the library. C、Get the book directly from Dr. Black. D、Ask Dr. Bla

W：Have you decided when you are going to take your vacation?
M：No，I haven’t．I might take it in April，but then again．I might wait until December．I’m not at all sure yet．
Q：When will the man take his vacation?

M：May I take this book out? I need it to work on my paper for Dr．Black’s chemical class．
W：I am afraid not．This book has been put on reserve Dr．Black，Unless you have his written permission，we won’t let it out．
Q：What should the man do to borrow the book？