"Το παιδί θα δει την επόμενη διαφήμιση."

[Theofa]

There is a difference between "advertising" and "advertisement"? If yes what?

[mizinamo]

"advertising" is a mass noun and refers to the action or practice, or to a mass of adverts collectively.

"advertisement" is a count noun and refers to a specific piece of advertising.

[Theofa]

Thank you for clarification!

[Lng52-._]

I used "commercial" (instead of "advertisement") and it was graded as incorrect by DL.

[kathynash]

to look at is the same as to watch

[D_..]

To look at, to see and to watch are all different to one another and cannot be used interchangeably. Depending on what meaning you want to convey you need to choose one of the three.
http://dictionary.cambridge.org/grammar/british-grammar/look-at-see-or-watch