She ________an old friend of hers yesterday while she was shopping at the department store.(2011·天津)
Is this the reason _______ at the meeting for his carelessness in his work?
All of the flowers now raised here have developed from those _______ in the forest.
Our company will move to a tall building _______ we worked two years ago.
Our company will move to a tall building _______ has just been complete.
Our company will move to a tall building _______ we bought last month.