Free Rice is a great website for a couple of very good reasons.
Firstly it helps you get better at knowing what words mean. It can increase your vocabulary. If you click on the speaker to the right of the word your computer will say the word out loud.
For every word you get right the organisers of the web site donate grains of rice to people who are hungry.
Give it a try and see how you get on. Let us know in the comments.