Spelling tion, cian and sion words

How is the /shƏn/ sound spelled in these words?
Choose from tion, cian or sion.

Work out which letters are missing	Type the whole word:
Air pollu___ is bad in many cities.
They had a magi___ at the children's party.
My credit card never leaves my posses___.
Rocket propul___ has enabled space travel.
A politi___ will speak at the meeting.
The infec___ was caused by rotten food.
Do all novelists need a vivid imagina___?
I'd like to hear your ver___ of events.
Preven___ is better than cure.
We are building an exten___ to our house.
Get an opti___ to test your eyes.
Head in a northerly direc___.

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