Take a spelling test and track your progress: The -tious ending.
In these words the sound /sh s/ is spelled tious.
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Learn more in Unit 30. Words with ci and ti e.g. ancient, special, initial, gracious
"I would like to thank you so much for this great website. I have always been ashamed of my spelling but after a few lessons I am already better. It is filling in all the gaps. Thanks."
Student, France