A. heldB. preventedC. darkenedD. blackened

The 2008 summer Olympic Games ______ in Beijing.A、were heldB、heldC、was heldD、holds

A．making itB．preventedC．handicappedD．protected

The drinking water is contaminated with impurities.A.blackenedB.pollutedC.darkenedD.mixed

Jack ran quickly to his dormitory, three books______under his arm.A．were heldB．to be heldC

The boys in the dorm____a coin to decide who would clean the floor.（2012-77)A．heldB．tossed

Her career has ______ a number of activities—composing, playing and acting.A．heldB．produce