Fill in the blanks:

- If two angles are complementary, then the sum of their measures is
- If two angles are supplementary, then the sum of their measures is
- Two angles forming a linear pair are
- If two adjacent angles are supplementary, they form a
- If two lines intersect at a point, then the vertically opposite angles are always
- If two lines intersect at a point, and if one pair of vertically opposite angles are acute angles, then the other pair of vertically opposite angles are