I regret ________ that you have failed the exam, but what you should do now is not to regret ______ so much time but to seize every moment from now on.

After half a year’s training, they were made entirely used   ____     underwater.

I climbed the stairs slowly with a big suitcase, my father         with two more.

She was the only one __________ the wreck.

It was so cold that he had the fire ___________ all night long.