______ world’s largest retailer, Wal-Mart, has opened its _____ third store in Beijing, which means the firm now has 52 stores in China.
—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.