It was the largest experiment we had ever had; it _____ six hours.
—Did you find out the time of the train to Miami?—Yes, the early train is _______ to leave at 5:30 a.m.
The trade union intended to call on the workers to go on strike _______ the government’s limitation on exports.
Traditionally, college students hold a graduation ceremony to encourage themselves before they _______ on their life journey.
Our school requires that all students _______ on the campus.
At the routine office meeting, the headmaster insisted that the problems _______ paid special attention to.