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1. I have know Michelle ... our carefree childhood
For
Since
During
2. He kept so calm ... the business meeting
During
For
At
3. I am extremely swamped today. I won`t be able to talk to you ... 6 p.m.
Until
At
For
4. She regularly goes for a run ... breakfast.
in
before
At
5. He has been living ... Moscow ... 1999
in,since
in,by
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1. Since
2. During
3. Until
4. Before
5. In, since