What does this line mean?

Should I really believe that rumor?

The source of this river is at the top of the mountain.

The real pleasure is made using the whey that comes out in the process of making cheese.

My father is a graduate of Teikoku University.

This trash is inflammable, so please do not place it near fire.

Please heat the meal.

I find it difficult to enjoy this job while doing it.

My father will turn 61 years old this year.

My computer is overheating and I can't proceed with my work.