In much of Alaska, the growing season is _____ short that crops can't be raised.

The giant squid is _____ an elusive animal that at one time it was believed to be

purely mythical.

The mineral grains in basalt are ____ small that they cannot be seen

with the unaided eye.

The mineral talc is ____ soft that it can be scratched with a fingernail.

Oceanographers use robots and unmanned submarines to explore parts of the ocean that are ____ deep for people to explore safely.

The walking stick is an insect with _____ a close resemblance to a twig that it escapes the notice of its enemies.

At present, solar cells are _____ expensive and inefficient to be used in the commercial generation of electricity.

Acrylic plastics are very hard and are

_____ clear as glass.

Founded in 1682, Norfolk developed ____ prosperous sea trade that it quickly became the largest town in the colony of Virginia.

Continental islands are ____ close to continents that their plant and animal life are identical to life on the mainland.

A few people have ____ good eyesight that they can actually see the brightest stars during full daylight.