Answer:
device The whole passage is about a device and the other words are about what happen
Declarative: <em>Makes a statement, using a period.
</em>Interrogative: <em>Asks a question, using a question mark. (?)
</em>Imperative: <em>Makes a demand, using a period.</em>
There is also a fourth type of sentece:
<em />Exclamatory: <em>Expresses strong feeling, using an exclamation point.
</em>However, exclamatory sentences are always one of the above as well.
