After working for twenty hours without any rest, the doctors were _______.
A
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ThecollegestudentsinChinaare_______fromsmokingoncampusbecausethiswilldothemnogood.
Studentswith_______problemsmayapplyforstudentloans.
Whenmakingmoderncameras,peoplebeganto_______plasticsformetal.
Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.