- Without oxygen, animals could not live. We cannot see oxygen, but this gas makes up about one-fifth of the air we breathe. A glass jar full of oxygen looks
Your answer:
heavy.
wet.
dry.
empty.
- People who act in stage plays must learn their parts by heart. This requires an excellent
Your answer:
audience.
voice.
memory.
stage.
- Farm work used to be considered dirty work, but that was before modern implements and construction took the drudgery out of farming. Barns, hen houses, and even pigpens now have floors that can be cleaned with a hose. This means fresher eggs, finer meats, and purer milk for everyone as well as better working conditions for
Your answer:
city dwellers.
machinists.
farmers.
children.
- The United States Coast Guard is a part of the U.S. armed forces. During a war, it assists the Navy in escorting ships and in protecting ports. During peacetime, it has many duties; it is best known for its rescue operations. Many small boats that get into trouble are brought to shore safely by the
Your answer:
helicopters.
crew.
Coast Guard.
Navy.
- Although some animals do not eat plants of any kind, they do eat the flesh of plant-eating animals. There would be no animal life at all if there were no
Your answer:
farms.
plants.
zoos.
forests.
- Cables are wire ropes that are used to send telegraph and telephone messages from one place to another. Undersea cables are laid underwater. They carry messages across the
Your answer:
nation.
city.
oceans.
continent.
- In early days, automobile races were often held on country roads. Today, most of the car races are held on special tracks called speedways because of the greater danger of accidents in
Your answer:
foreign races.
sports-car events.
open-road racing.
stock-car racing.
- Copper is used for the bottom of cooking pans because it does not rust and because it is a good conductor of
Your answer:
heat.
electricity.
light.
sound.
- Many of the ancients believed that the earth was flat. Scientific evidence that the earth is round is now accepted by most people. Space flights round the earth would not be possible if the earth were
Your answer:
flat.
cold.
old.
round.
- We were driving through the forest at night when a large owl landed on the road only a little way ahead of our car. It did not seem to want to move; we did not want to hit it, so our driver moved the car forward
Your answer:
quietly.
recklessly.
quickly.
slowly.