For each sentence select what you think is the missing word!
1)Mary has been waiting for a reply ..... weeks.
2)I've been working on the project ..... January.
3)We've been here ..... nine o'clock.
4)I have studied non-stop ..... 9.15.
5)David has known Mary ..... 1996.
6)He's worked in this department ..... three months.
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