〈1권〉
Chapter 1. Science
UNIT 1 What Is a Desert?
UNIT 2 The Water Cycle
UNIT 3 Alligators and Crocodiles
UNIT 4 Forests
UNIT 5 Insects
UNIT 6 The Solar System
UNIT 7 Climate
UNIT 8 What Is Light?

Chapter 2. Social Studies
UNIT 9?The Mighty River: The Nile
UNIT 10 The Statue of Liberty
UNIT 11 Abraham Lincoln
UNIT 12 Helen Keller
UNIT 13 The First Thanksgiving
UNIT 14 The Wild West
UNIT 15 Good Citizens
UNIT 16 Chinese New Year

Chapter 3. Language Arts & MathM
UNIT?17 The Magic Pot
UNIT?18 How Man Got Fire
UNIT?19 Fingers, Stones, and Bones
UNIT?20 A Smart Counter


〈2권〉
Chapter 1. Science
UNIT 1 Severe Weather
UNIT 2 The Four Seasons
UNIT 3 Rainforests of the Sea
UNIT 4 What Flowers Do
UNIT 5 Butterflies and Moths
UNIT 6 Stars and Planets
UNIT 7 Volcanoes
UNIT 8 Sound

Chapter 2. Social Studies
UNIT 9?The Rocky Mountains
UNIT 10 The Great Wall of China
UNIT 11 George Washington
UNIT 12 Benjamin Franklin
UNIT 13 Immigrants to America
UNIT 14 The Civil War
UNIT 15 Recycling: A way to Save
UNIT 16 Who Is Santa Claus?

Chapter 3. Language Arts & Math
UNIT?17 The Ten Suns
UNIT?18 Tikki Tikki Tembo
UNIT?19 Fingers, Stones, and Bones
UNIT?20 A Smart Counter

〈3권〉
Chapter 1. Science
UNIT 1 Tornadoes: Severe Thunderstorms
UNIT 2 Different Types of Pollution
UNIT 3 Life in the Polar Regions
UNIT 4 What Roots Do
UNIT 5 Ants Are Social Insects
UNIT 6 Black Holes
UNIT 7 The Causes of Earthquakes
UNIT 8 Everything Is Matter

Chapter 2. Social Studies
UNIT 9?The Grand Canyon
UNIT 10 The Eiffel Tower
UNIT 11 Inventing the Telephone
UNIT 12 Henry Ford: An Icon of the Modern Automobile
UNIT 13 Pompeii Comes Alive
UNIT 14 A Great Earthquake Hits San Francisco
UNIT 15 Endangered Animals
UNIT 16 Stars on Flags

Chapter 3. Language Arts & Math
UNIT?17 The Hunter and the Crocodiles
UNIT?18 How Springtime Comes
UNIT?19 Why We Need Fractions
UNIT?20 Even and Odd: Strange Cousins