President Xi Jinping demanded that the environmental problems ______ paid special attention to.
---Karen, can I talk to you for a minute?---Sure, ____?
She was accused ____ cheating in the exam and was to ____.
The idea puzzled me so much that I stopped for a few seconds to try to _____.
The man ____ of killing his family members was reported to have been taken to the police station
School children must be taught how to deal with dangerous _____.