Sorry, Mr. Wang. I didn’t finish the assignment yesterday. Oh, you ________ have done it as yesterday was the deadline.

The old photos buried at the bottom of the suitcase________me of those happy old days we had spent together. [ ]

A successful life is a life ____challenges are met and difficulties overcome.

There is much chance________Bill will recover from his injury in time for the race.

wrote a letter of complaint(投诉)，and the airline have promised to _______the matter．