21. Perseverance is a kind of quality, and that’s ______ it takes to do anything well.
________to be the best among the competitions, he was given $ 20,000 as a reward.
At the________of audience, the famous singer sang another one.
—What would you do if it________tomorrow? —We have to carry it on, since we've got everything ready.
The victim was still________what had happened when the doctor arrived but he lost________soon after that.
We'll have to find a job, ________.