You can go out, _________you promise to be back before 11 o'clock.
It was an unpleasant subject ____ we _____ for a long time.
It must have rained last night, ________ the ground is wet now.
The serious expression of the captain kept his crew _________.
The tomato juice left some _____ on a customer’s skirt, which made the waitress nervous.
The notice says “No Photos!” so reporters must ask _____ before taking photos inside the museum.