1. The ___ is a device used to communicate over long distances.

• telephone
• telescope
• television

2. Plants need sunlight and water to ___ .

• grow
• shrink
• sleep

3. A ___ is a scientist who studies the stars and planets.

• biologist
• astronomer
• chemist

4. The ___ protects the body from illness and infection.

• heart
• muscle
• immune system

5. To ___ means to make something new or original.

• invent
• break
• follow

6. A ___ is a place where you can see wildlife in its natural habitat.

• zoo
• park
• reserve

7. The ___ is the part of the plant that grows underground.

• root
• leaf
• stem

8. In the past, people used ___ to send messages over long distances quickly.

• telegraphs
• letters
• smoke signals

9. A ___ is a large natural stream of water flowing in a channel to the sea, a lake, or another such stream.

• river
• pond
• mountain

10. The process of changing a liquid into a gas is called ___ .

• freezing
• evaporation
• condensation