____ people value the environment, they will use public transport where possible.
If
____ security checks don't take too long, flights will depart on time.
Provided that / If
Flight departures will be delayed ____ weather improves.
unless
The government may have to prohibit whale-watching trips; ____ breeding may be affected.
otherwise
Demand for imported goods will rise____ the price of local products goes up any further.
if
6 The local economy is expected to remain strong, ____ exchange rates remain stable.
provided that / if
____ it stops snowing soon, some rural areas will get completely cut off.
Unless
Check your passport is still valid ____ you won't be allowed to get on the plane.
otherwise
