_______ difficult and challenging the task may be, we must finish it on time, because there is a possibility _______our work will go down in history.
Even if they are on sale, these refrigerators are equal in price to, if not more expensive than, _____ at the other store.
His landlady gave him a week's _____ to leave the flat.
The noise was so _____ that only those with excellent hearing were aware of it.
We can't _____ one to ch ange the habits of a lifetime in a short time.
Mary went to the box office at lunch time, but all the tickets ____out.