1. Lesson 28 The Top of the World Climbing Mount Everest Vocabulary

2. Very top of a mountain Summit At the end of the day, the explorers reached the summit of Mt. Everest.

3. Adjust to a new condition or environment Acclimate The kids were acclimated to the cold and played soccer wearing shorts in the snow.

4. You are used to something because it is a regular part of your life. Accustomed He was accustomed to the bumpy ride home, because he had ridden the bus since kindergarten.

5. Safe and not likely to give way Secure The gate was secure after school hours.

6. Something that is absolutely necessary. Essential It is essential to have a pencil when you come to class.

7. The design is efficient and has no unneeded parts. Streamlined The streamlined car zoomed around the track, purring like a kitten.