Answer:
preparing dinner
object of a preposition
Explanation:
In <em>very simple words</em>, gerunds are nouns (that end in -ing). As nouns, they can function as subjects and objects depending on their position in the sentence.
I think math because you have to use math to do your taxes, shopping, school work, and a lot of other things
I also think Science is a good subject to learn because then, you learn about the earth and world around us !
History is an amazing subject to learn about because you learn about what happened before us. You learn about how far we come.
I do not think English is a good subject to learn about because it tells you how to feel about the books you read. Don't get me wrong I love the way it teaches you your grammar ,but I do not think it's the most important thing to learn.
Changing the wallpaper can help enhance the appearance of your computer's desktop, please change the subject to what your asking which is technology.