Sure! Here’s a completed version of the text with suggested words for each blank:

V. Fill each blank with a word

Health is something we tend to ignore when we have it. When our body is **(1. healthy)**, we are hardly even **(2. aware)** of it. But illness can come, even **(3. when)** we are young. In fact, childhood has been a very **(4. difficult)** time. Many **(5. diseases)** attacked children, particularly and people knew very little about **(6. how)** to prevent such illnesses or how to **(7. treat)** them once they struck. The **(8. reality)** was that many children died. About a century ago, however, scientists **(9. found)** out about germs, and then everything **(10. changed)**. The **(11. result)** of many diseases were found and cures were developed. As this medical **(12. knowledge)** spread, the world became **(13. safer)** for children. The result is **(14. significant)**, whereas a hundred years ago the average life span was only **(15. 47)** years, today in many **(16. parts)** of the world, people can expect to **(17. live)** for 80 years. What do we expect **(18. in)** the year 2050? Undoubtedly, medical science will continue to advance. Some people will be able to **(19. solve)** medical problems that are unavoidable today.

Feel free to adjust any of the words as necessary!