5道英语选择题,要答案和理由,急用.

5道英语选择题,要答案和理由,急用.
He was sitting with his head ___ a book.
A.buried B.buried in C.burying D.burying in
A novel ___ "Gone with the Wind " is very famous.
A.calling B.call C.to call D.called
I am used ___ late at night.
A.to sleeping B.sleep C.slept D.to sleep
____ my efforts on persuasion ,he wouldn't agree.
A.Even though B.In spite of C.Even if D.Though
I fail ____ why you find it so amusing.
A.to understand B.understanding C.to understanding D.understood