Obama didn’t explain ______ any larger principles have guided him through the historic convulsions of the 2011 Arab Spring.
—Did you look up the time of trains to Shanghai? —Yes, the early train is ________ to leave at 5:00 am.
—Who is the man, actually? —I don’t know for sure. But I think he can be _______ but a teacher.
—______ you got to know my telephone number? —Through a friend of yours.
Jack is good, kind, hard-working and intelligent. _____, I can't speak too highly of him.
It isn't so much whether he works hard; the question is whether he works _____.