We'll be late [ ] you don't hurry up! [ a) if b) unless 	if
They shouldn't postpone the deadline [ ] they really have no choice [ a) unless b) provided that 	unless
You may sign this contract [ ] you are a legal representative [ a) unless b) provided that 	provided that
[ ] it doesn't slow down negotiations, you may take notes [ a) As long as b) Unless 	As long as
[ ] your estimates are right, you could start selling next month [ a) Assuming b) Unless 	Assuming