根据句意，从方框中选出恰当的单词，用其正确形式填空。每空格限填一词，每词限用一次。

1. I think documentaries are             because I can learn a lot from them.

2. The two pictures look same, so I'm            to see the difference.

3. I'm going to be a           when I grow up, because I want to live in the countryside.

4. English can help           know more about the world.

5. Sometimes the police use          trained dogs to catch thieves.

6. Fred fell in love with Gina, and they got          last month.