After working for twenty hours without any rest, the doctors were _______.
A、exhaustedA
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Wecannottrusthimanymorebecauseheoften________hisduty.
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
Itisnot---_______formetoreturnallthebookstothelibrarynowbecauseIstillneedsomeofthemformyresearch.
Whenaspacecrafttravels,oneofthemajorproblemsisreentryintotheEarth’s_______.
Ifyouhaveanyproblemsduringyourstudyhere,pleasedonot_______tocallmeforhelp
