1. Gas companies put a smelly chemical in natural gas so that a dangerous gas leak can be by smell.

2.  People from different cultures sometimes the same gesture in different ways.

3. In bright sunlight, the of your eyes get smaller.

4. Multiplication is repeated addition made simpler.

5. Is it possible for my brother to use to find out what I am thinking?

6. The that lines the skull is made up of strong fibrous tissue.

7. Hearing aids may some hearing after hearing loss has occurred.

8. Learning to read is to success in school.

9. Milk is a good source of Vitamin D, an vitamin for good health.

10. When you read, you can often or see in your mind, the setting and action of the story.

11. Glaucoma is an that can result in blindness if it goes untreated.

12. The eyes, ears, nose, skin, and mouth are organs that help people experience the world around them.

13. A noisy jet engine produces about 140 of sound.

14. The horse has been trained to jump over walls or other on the jumping course.

15. The sense of smell begins when cells in the nose respond to chemicals in the air.