When winter comes,some girds will fly to the south,__will stay in the north.Who can tell me the choice of the problem?Thanks a lot!

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When winter comes,some girds will fly to the south,__will stay in the north.Who can tell me the choice of the problem?Thanks a lot!
When winter comes,some girds will fly to the south,__will stay in the north.
Who can tell me the choice of the problem?Thanks a lot!

When winter comes,some girds will fly to the south,__will stay in the north.Who can tell me the choice of the problem?Thanks a lot!
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