Complete the following sentences,using the words given in brackets!

Complete the following sentences,using the words given in brackets!
1.I ...that it was a mistake to let him go（can´t help）
2.After drinking heavily at the New York´s Eve party,...the next morning with a painful headache（waken）
3.His classmates tried to...swimming across the lake,but he did not listen（dissuade）
4.After studying Uint One,we all..our study habits（set out）
5.I recognized him as a friend of my father´s whom I...once or twice（previously）
6.Of all American cities,San Francisico is considerd by many to...beautiful（by far）