Her genuine love for you may _______ what she has sacrificed (牺牲)to make you succeed. 

.It is no use ______ after you know your failure.

.He _______ to act out the story he had read, but he failed. 

 --- How long will you be staying? .  --- I don’t know.              .

I can’t thank you too much for your kindness because without your help I        have won the first prize in the speech contest．