Sometimes, when we are reading we come across new words that we don't understand.
There may be somebody around who we can ask, or we can use a dictionary, but we can also use context. This means looking at the rest of the sentence to see if it helps us understand the new word.
For example:
Jack was so hungry that he didn't leave a single particle of the cake on his plate.
You may not be familiar with the word 'particle', but from the context you can guess that it means a very small piece of something.
Are you ready to have a go at some questions now?