Possible Clues:

• Make a choice -- the compiler's is electronic to get best result
• Make best use of work -- time is flexible
• Modify to achieve maximum efficiency
• Take full advantage of work I'm to bring into relocated site
• Tune up (S, not Z)
• Make the best of (something)
• Work time is flexible, so make best use of it
• Operation is in time to achieve the best effect
• Make the best or most effective use of
• Make as effective or favourable as possible