She may have missed the train,____ she won’t arrive for another hour.
—Are you ready to leave? —Almost, I’ll be ready to go just as soon as I _______ putting the clean dishes away.
What shall we use for power when all the oil in the world has _______?
How can he _______ without money for food during the journey?
John said he had been working in the office for an hour, _______ was true.
The science of medicine _______ progress has been rapid lately is perhaps the most important of all the science.