1. The Earth is a _______, but the Moon is not.

2. The Earth goes around _______, but the Moon goes around the Earth.

3. The diameter of the Moon is only _______ of that of the Earth.

4. The Earth's _______ is very thick while the Moon's is not.

The Earth has a lot of oxygen and water while the Moon does not.

5. _______ on the Earth is strong while on the Moon it's weak.

1. A. star                                 B. planet                     C. world

2. A. the Moon                        B. the                          C. the Sun

3. A. one-fourth                      B. one four                  C. once

4. A. space                              B. atmosphere             C. air

5. A. Oxygen                          B. Water                      C. Gravity