Well, you can buy $20 tickets or 30 $ tickets, ______ you prefer.
______ the call for help, the boys immediately rushed out to see what was going on.
______ their life in the past, ours is much better.
The soldiers ran as fast as they could, ______ to catch the fleeing enemies.
______ for half a month, the town was running out of food and clothing.
_______ for the coming examinations before, I have no time for the film.