2012年4月4日,福建省漳平市将24名新一届政府部门任职人员供职发言的内容与供职发言时的照片公布在漳平人大网站监督工作栏目,零距离接受监督。对政府权力进行有效制约和监督的关键是( )
Shortly after the accident, _____ policemen were sent to the spot to keep order.
Although he knew little about the work done in the field, he succeeded ____other more experienced experimenters failed.
There is a small object _____ a pin on the desk.
His uncle went abroad in 2010, and __________ since.
It's a rule for all the students to _____ their places ahead of 5 minutes waiting for the class to be started.