I promised we’d do something easy this time.
I realised that some students of mine didn’t know what you call the parts of the eye.
Yes, the black thing inside is a pupil, the same word for a child/school student.
Here is a picture of an eye. Look at the picture, then do the quiz.
Quiz (Easy) 
You can do this quiz online here.
Want to read and/or do more Easy/Easier Vocabulary quizzes?
Here are some more:
Homonyms (Words that Sound the Same)
If you have any questions about the subject of this post, let me know in a comment below.