—You were out when I dropped in at your house. —Oh, I ________ for a friend from England at the airport.
— I'm sorry I've lost your software. Let me buy a new one. —________.
There used to be a temple in your village,________?
The new bridge is ________ the one built last year.
________knowledge a man has,________it is for him to get a good job.
Many chemical substances react________oxygen.