1.  Ordinary people used to think that animals couldn't think or have feelings.

2.  Next in line, Charies Darwin also believed that animals could think in some ways.

3.  It is reasonable to consider that animals is consciously thinking about what it is doing.

4.  I agree on the view that animals can think.

5.  It is reasonable to consider that the animal is consciously thinking about what it is doing.

6.  What we need to do is to verify whether or not animals could think.

7.  It is reasonable to consider that the animal is consciously thinking about what it is doing.

8.  In conclusion, I approve of the opinion that animals can think in their own way.

9.  Indubitably animals do think.

10.  Everyone who has a pet may say, animals really think.