one of a group of reptiles that lived millions of years ago
We can see dinosaurs in museums today.
hard
involving or requiring a great deal of work, effort, and care
This is a hard problem to solve.
joke
something said or done to make people laugh
We all laughed out loud when he joked about his funny experience.
lesson
an activity which helps people learn something
How many piano lessons do you have a week?
let
to allow someone to do something
My mother let me play computer games before dinner.
math
the science or branch of knowledge dealing with measurements, numbers and quantities.
The math homework was really difficult.
understand
to know the meaning of the words that someone is saying or the language that he or she is speaking
This book is too difficult for me. I can't understand it, at all.
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