You can’t believe how terrible the fire is __________ you see it with your own eyes.

Could you come back home at three o’clock一 .The meeting in our school won’t be over at that time.

Neither the headmaster nor the teachers _____ take a vacation next week.

People often use it ____ ships.

She had to work deep into the night, ______she couldn’t have spread the messages to all the relevant people successfully.