Here are the answers for the blanks in the advertisement based on the context:

1. (1) **D. Inventions** - This fits best as it refers to the new technological items being showcased at the exhibition.
2. (2) **A. Many** - This is the correct quantifier to use with countable nouns (devices).
3. (3) **C. Improve** - This option conveys how innovations can enhance or make daily life better.

So the filled advertisement would read as follows:

**Step into the Future at the Tech Trends Exhibition!**
Come join us at the Tech Trends Exhibition, where you can explore the cutting-edge **(1) Inventions** of tomorrow! From AI to 3D printing, there will be **(2) Many** exciting devices for you to interact with and discover. Don't miss the demonstration sessions, where tech leaders will showcase their newest creations and explain how these innovations can **(3) Improve** your daily life.