单项选择题
A. Queue here to buy tickets for this event. B. You must have tickets for this event. C. Tickets are now on sale for this event.
A. To set the alarm, you need to press the button three times. B. There are three buttons needed to set the alarm. C. After pressing a third button, you finish setting the alarm.
A. producing enough goods. B. delivering enough goods. C. selling enough goods.