—How did you sleep last night? — Oh, I slept like a log last night. What does the underlined part mean?

____ to the surprise of the teachers, the naughty boy turned out to be the person who saved the dying girl. 

-- You seem to be burning yourself out with so much work!-- ______. I'm dying for a thorough rest and a good workout.

Although the new road is being used, it has not yet been _______opened.

“Facial transplants are no longer science fiction imagination ,”a surgeon has said,____that they are ___possible but  technically complex..