I don't think so! 5 letters

Crossword clues for I don't think so! 5 letters

Answer	Clue
THINK	Cerebrate.
THINK	Use one's head
THINK	With 61-Across, carefully consider ... or a clue to this puzzle's theme
THINK	Use gray matter
THINK	Motto for the office wall.
THINK	Use the bean
THINK	Tank type
THINK	Good motto for everyone.
THINK	___ twice (reconsider).
THINK	1968 hit for 42-Across
THINK	Use your noggin
THINK	Just _____!
THINK	Exercise one's gray matter
THINK	See 1-Across
THINK	Reason
THINK	Type of tank
THINK	Use one's noodle
THINK	Believe.
THINK	Sign on an office wall.
THINK	Sign in an office.
THINK	Ideate
THINK	Something to do twice?
THINK	Get ideas
THINK	Use your noodle
THINK	Old IBM motto
THINK	Engage in cerebration
THINK	Do some cerebrating
THINK	Ruminate
THINK	Brainstorm
THINK	With 19-Across, reconsider ... or a hint to the starts of the five starred clues
THINK	Be reasonable?
THINK	End of the observation
THINK	Put your mind to work
THINK	Try to remember!
THINK	Aptly named Final Jeopardy! theme song
THINK	END OF QUOTE
THINK	Dream (up)
THINK	Assume
THINK	Cogitate
THINK	Use your head
THINK	I need you to remember this!
THINK	IBM's __ exhibit
THINK	Famous IBM office sign
THINK	Ponder
THINK	Popular office sign
THINK	Deliberate
THINK	Reflect
THINK	Use one's gray cells
THINK	Rack one's brains
THINK	Use your brain