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VI. Complete the sentences by filling in each blank with for or since.

1. Duong has studied Korean ______ five months now, and he can already hold basic conversations.
2. I haven’t seen Sarah ______ our last class reunion.
3. The temperature has dropped significantly ______ the storm passed through yesterday.
4. He has been trained for the marathon ______ nearly half a year and is in peak physical condition.
5. The weather has been terrible ______ the beginning of the month.