Pine trees are usually believed to _______ cold weather.
D
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Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.