The prisoners _____ to escape, but failed.
Being able to speak another language fluently is a great ______ when you're looking for a job.
Mary wanted to travel around the world all by herself,but her parents did not ______ her to do so.
Now I come here at the ______ of Mr.Smith to assist him finishing the work.
He left ______ with my secretary that he would call again in the afternoon.He said he would keep ______.
I sat until after eleven,______in a book.