Vast flows of information is carried on hair-thin fiber optic cables.   The crafting of fine violins has been proceeding for several century as a secret art.   Linguistic conflicts…

199. ________ lived on Earth for nearly 150 million years. A. Dinosaurs B. Dinosaurs who C. If dinosaurs D. Since dinosaurs 200. Early printers arranged type into ________ a small,…

189. On December 17, 1903, the Flyer ________near Kitty Hawk, North Carolina, with Orville Wright as pilot. a. took off b. it took off c. taking off d. took it…

169. Although knives and forks ________ prehistoric origin, spoons are relatively new. a. are b. they are c. are they d. which are 170. Neptune’s ________ the planet in the…

149. ________ the second most common metal in the Earth’s crust, and it always occurs in combination with other substances. a. Iron b. Iron is c. With iron d. With…

Water stored behind a dam can used to drive turbines.   Our universe may continue to expand as it gets colder, empty, and deader.   Every form of matter in…

129. ________ the deepest valleys and canyons on the Earth. A. In the Pacific Ocean with B. In the Pacific Ocean C. The Pacific Ocean D. The Pacific Ocean has…

Coal, petroleum, and natural gaseous are all fossil fuels.   The mass of neutron stars generally range from one-tenth to twice the mass of the Sun.   Grasses grow in…

109. Most cells in multicelled organisms perform ________ functions. A. specialize B. specialized C. they specialize D. specialization 110. The big island of Hawaii, in the middle of the Pacific…