(2013·江西，24)What a terrible experience！________，you're safe now—that's the main thing.

All too _____ it was time to go back to school after the glorious summer holidays.

Professor White has written some short stories, but he is ______known for his plays.(NMET  1998)

Hurry up, honey! We have to arrive at the airport by 11:00 o’clock, _____ we will miss the flight.   

The traffic problems have severely affected economic development. ________, we must spare no efforts to solve them.