Only when you told me about it ________ what a silly thing I had done.

Daily Mail of November 25th reported that American astronomers （天文学家）______aplanet that was most similar to the earth.

Did you hear a terrible fire happened in the hotel near our school last night? – Yes, it took the firemen an hour to_______ the fire.

Please stop _________.It’s time for class.

His answer was _______, so no one could make out what he meant.