There were many students and teachers at the party yesterday. I looked for two seats to sit down with my friend, Tim, but there were ____.
—Have you moved into your new teaching building? ---Not yet. It ________.
--How about going for a walk? -- _____, but maybe it would be better to play cards.
Do you know the year _____Einstein died?
That is the reason _____I refused it.
This is the factory _____my father worked ten years ago.