They (referring to women or girls) are my best friends.

The vesical sphincter plays a crucial role in controlling the excretion of urine.

He was diagnosed with bladder cancer.

Have a good day at school, son.

When her son goes to school, the mother always says 'see you later'.

Well then, I'm off.

He was going back and forth between the office and home all day.

I'm just going to the supermarket, okay?

I will go to the library and come back.

It seems this problem is not straightforward.