Dad suffers because of teacher

The teacher told Vova:

- If you are lazy to study, you will only make your parents suffer.

- My father said that it was her who made him suffer, had to think a lot and sometimes even had insomnia.

- Are you kidding me?

Blushing slightly, the teacher asked again: Can you explain more clearly?

- Yes, because the teacher gave too much homework, my dad couldn't do it all.

Bleaching

During Chemistry class, the teacher saw Ti playing something behind. She asked:

- Ti, can you tell me what kind of acid is commonly used in bleaching?

- Yes, there are many types.

- Can you tell me what types they are?

- For example, Omo, Tide or Vi dan!