The ponderosa pine is _________________ of most of the timber used by forest-product firms in the black hills of South Dakota.
Computers that once took up entire rooms are now ______________ to put on desktops and into wristwatches.
According to some educators, the goal of teaching is to help students learn what _______________ to know to live a well-adjusted and successful life.
The sapphire’s transparency to ultraviolet and infrared radiation makes _____________ in optical instruments.
______________ initial recognition while still quite young.
