The _______ work continued for more than a week but there was still no sign of the missing boy.
A、researchB
暂无解析
Theengineersinthislabspentseveralweeks_______theirplansforthenewbicycle.
Withthe_______ofMary,allthegirlstudentsareeagertogototheparty.
SomestatesintheUnitedStates_______peopletocarryguns.
Severalloudspeakersare_______fromtheceilingandwecanhearthespeakerveryclearly.
Thismorningintheclass,ourteacherlosthis______atlastbecausehecouldnotstandanymore.
