This morning in the class, our teacher lost his ______at last because he could not stand any more.
A
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Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
He_______tostudyharderinthefuturesothathecouldhavemoreopportunitiestofindabetterjob.
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
Weare_______attherapidprogressMarkhasmadeinthissemester.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.