This boat rows six oars.
The travelers found that the oasis was only a mirage.
He took an oath to give up smoking.
He had a bowl of oatmeal porridge for breakfast.
That child is obedient to his parents.
The light microscope magnifies the object 1000 diameters.
He has a strong objection to getting up early.
His objective was to finish by October.
We should make an objective appraisal of his job.
He felt obligated to help.
You are under no obligation to answer our questions.
Attendance at tonight's meeting is obligatory.
I was obliged to abandon that idea.
The road obliques from the river.
He was oblivious of his dream.
His cruelty was obnoxious to all.
Don't be obscene.
Some parts of his letter are rather obscure.
The company holds its people to strict observance of that code.
They carefully observed the behavior of deer.
He is obsessed by hobbies.