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A _______ is a chemical made in the body.
When a prisoner is given time off his sentence it is called getting ______.
If you _______ a piece of music or a letter, it means you write it.
I don't want to go but I _______ I must.
Please don't _______ me by saying that.
The _____ layer protects us from the sun.
A _______ is a very small living thing, also called a micro-organism.
This ________ needs a stamp.
You will see this more clearly under the __________.
Use a _________ to see in the distance.
A _________ is a very useful device.