Fill in the blanks with acute, obtuse, right or straight:
(1) An angle whose measure is less than that of a right angle is ___
(2) An angle whose measure is greater than that of a right angle is ___
(3) An angle whose measure is the sum of the measures of two right angles is ___
(4) When the sum of the measures of two angles is that of a right angle, then each one of them is ___
(5) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be ___