Pg 431

Pg 431
Exercise 20
(Independent, Subordiante)
1. After diving sports became popular, the United States created an underwater national park.
2. Divers can see animals, fishes, and coral while they use underwater signs to find their way around.
3. Some divers search for treasure, while other divers explore nature.
4. When divers visit shipwrecks, they use modern devices to find artifacts.
5. There is much to explore underwater because the ocean is so vast.
Exercise 21
(Subject, Verb)
1. Some people have trouble breathing through a snorkle, but it becomes easier with practice.
2. Lessons are given in swimming pools, so the students feel comfortable and safe.
3. Divers enter the water from a boat, and they go in feet first or backward.
4. One should take a deep breath first, for water may get in the snorkel tube.
5. It is easy to swim with the fins on, and the flutter kick helps you go faster.
Exercise 22
Answers will vary
Exercise 23
1. (While they are under the water,) divers are in a new and silent world.
2. (Unless divers are careful,) motor boats could pose a danger.
3. Boaters have difficulty seeing divers (when divers are under the water.)
4. Some fish, (since they are so curious and unafraid,) will follow divers.
5. (When a diver wants to surface,) she should swim up slowly.