I believe Duo uses odd constructions sometimes in order to teach us the limited vocabulary which has been introduced so far. It is difficult to construct natural sentences that utilize the entire dictionary if that dictionary is small.
Also in sentences like these you must rely less on context. This could be considered advantageous because it provides a greater challenge. Being able to recognize a word in a strange context can sometimes be useful. In the least, it makes you more aware of how firmly you have retained the word in your memory.