Tricky Word Forms

<http://www.flo-joe.co.uk/cae/students/strategy/wform/tricky.htm>

1
Your help has been.......... . I couldn't have finished my essay without it.
valuable
invaluable X
2
You'll enjoy reading this book. As well as being informative it's really ..... in places, too.
humorous X
humourous
3
Many people think that capital punishment is completely ......
unacceptable X
unacceptible
4
I'm getting a bit fed-up with your ....... behaviour. Why don't you try behaving like a grown-up?
childlike
childish X
5
More people are turning to organic food these days because they're worried about all the different ........ in processed food.
additions X
additives X
6
The patient lifted up his ...... hand for the doctor to examine.
bloody X
bloodlike
7
It was absolutely ........ trying to repair the broken bicycle.
useful X
useless X
8
He is an ........ by birth although he lived in Spain for most of his childhood.
English X
Englishman X

I got 5 out of 8. The correct answer is red.