4

Hadrian's Wall, England

4

Stonehenge, England

4

Windsor Castle, England

4

Canterbury Cathedral, Canterbury, England

3

Force

3

Chinese New Year

3

Rivers of the World

3

Work

3

Mahatma Gandhi

3

Thanksgiving Day

4

From the American Revolution to the Civil War

3

The Old Lady and Her Pig

3

Daniel Boone

3

Isaac Newton

3

Lazy Jack

3

Harbors of the World

3

Gravity

3

Stealing Sally

3

Christopher Columbus

3

The Old Lady and Her Pig

3

Stealing Sally

3

Motion

4

Maddy's Vermont Diary

3

Rabindranath Tagore

3

Florence Nightingale

4

Chip's Tips on Jamaica

3

Inertia

3

Lazy Jack

3

Charles Darwin

4

Maddy's Rhode Island Diary