Fill in the gaps with the correct words.

Paul was so scared that he started ... .
His heart was ... fast.
Sue was terrified, she was ... like a leaf and crying.
The whole experience is a ... ; we’ll never do it again.
Ann didn’t want to wear a dress in case her friends ... her.
The dog ... danger and started barking.
It’s a ... fear to be afraid of snakes, as some of them are poisonous.
When we sense danger, our brain sends signals to ... adrenalin around our body.
To understand the reason why some people have ... , firstly, we need to understand fear itself.
Bacteria on your mobile phone can ... an allergic reaction and cause a rash.