— I heard they went skating in the mountains last winter.— It _____ true because there was little snow there.
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.