Answer:
On the internet
Explanation:
The most advertisements I notice are pop-up messages on the internet. I spend a lot of time online, reading newspapers, buying things from online shops or chatting with friends.
I notice the advertisements there because they are very eye-catching. Their headlines are written in big, bold letters, aiming to catch the reader's attention. The headlines are also very interesting or thought-provoking, or offering a very good discount on products. It is difficult not to notice the advertisements on the internet as they are literary everywhere, even on social media where I spend a lot of time each day.
