—Oh, my God! We have missed the last bus. What shall we do?—I’m afraid we have no ______ but to take a taxi.

–Pete, what’s your favorite subject?–_______. It’s really interesting.

 At the foot of the hill you could hear nothing but the _____ of the running water.

The work is too hard, so ____ were needed. 

--Mr Lee，could you give me some advice on how to write an application letter?---With pleasure. Remember the letter should be written in the formal _____.