— The little boy saved every coin ____ he could buy his mother a present on Mother's Day.
— ____ great the boy is!
A:so that; How
B:such that; What
C:so that; What
D:such that; How
(Ⅰ)求证:BG∥面ADEF;
(Ⅱ)求证:面DBG⊥面BDF.