I have an eye but still cannot see.

Who am I?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

How can you take 2 from 5 and leave 4?

Can you solve this picture maths equation?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What has to be broken before you can use it?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?