_____the cause of the oil leaks, the specialists can not draw a conclusion before completing a thorough and detailed investigation.
— What can I do for you?— I’d like to borrow ______ book about ______ Pacific Ocean.
Something ______ wrong with the car, and it ______ not start.
— Did you watch Germany playing Greece last Friday night? — Of course. ______, up to now I have been staying up for every game of the UEFA Euro 2012.
It was dark when Mary went out. I wonder how she ______ through the black lane by herself.
Not until I ________ to work ____ how much time I had wasted.