If we want concrete proof, we are looking for ---.

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

People who were born at very high altitudes often have larger chests and lungs-______who live at sea level

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 alternative A,B,C or D that best completes the sentence: Rajiv failed because his answers were not ___________ to the questions asked.