You want to know the price of something so you say, ____ ?

Now that we have succeeded in isolating this drug and discovering its nature, our next problem is to plan its_______________ in the laboratory. Fill in the blank-

Choose the word which fits best in the text. He....to his men about the distance travelled each day.

Choose the word that best completes the text. "People from all over the world are sent by their doctors to breathe the pure, ________air in this mountain region."