You have to wait until you meet the sentence again, e.g. when strengthening this lesson.
Put in the phrase that should be accepted.
After it is reported "wrong", click on the "Report a problem" button at the bottom left (on the website) / on the little flag (in the iOS app) and choose the option "My sentence should have been accepted" (or something like that).
Demonstrative Pronouns The demonstrative pronouns in English are: this, that, these, and those. In German, in Nominative and Accusative, the demonstrative pronouns are the same as the definite articles. That means, der, die and das can also mean "that (one)" or "this (one)" depending on the gender of the respective noun, and "die" (plural) can mean "these" or "those." Der ist komisch! (That one is strange!) Meine Kinder? Die sind in England. (My kids? They/Those are in England.) When spoken, the definite articles can serve a similar function: Der Junge liest eine Zeitung, der Junge liest ein Buch. This boy is reading a newspaper, that boy is reading a book. The articles would be stressed in that case.