3. Polar bears for their fur. (to hunt)

Put the verb in brackets into the correct form. (Поставь глагол в скобках в нужную форму.)

Polar bears are hunted for their fur.

To answer this question, we need to understand the verb tense and form that is appropriate for the sentence. In this case, we are looking for the verb form for the present simple tense, as the action of hunting polar bears is a general truth or fact.

The subject of the sentence is "Polar bears," and the verb is "to hunt." Since the subject is in the third person plural (referring to multiple polar bears), we need to use the correct verb form, which is "hunt."

However, the sentence is already given in the present simple tense, so we don't need to make any changes to the verb form. Thus, the correct answer is:

Polar bears are hunted for their fur.

This sentence means that people hunt polar bears to obtain their fur. It is important to note that hunting polar bears for their fur is illegal in many countries due to conservation efforts and the protection of endangered species.