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Many kinds of birds fly south at the ______ of winter.

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to south  the south  to southwards  south  
them   which   what   those  
birds should be taught to navigate  a dove that has been caged will not fly long distances  some birds cannot fly at night  some birds seem to follow the stars when they fly at night  
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in need of    in exchange for    in search of    in return for  
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