Which of the following is correct? I enrolled on a computer course

I enrolled on a computer coarse

Which of the following is correct? His language is vulgar and coarse

His language is vulgar and course

Which of the following is correct? My car careered off coarse

My car careered off course

Which of the following is correct? The college runs language coarses

The college runs language courses

Which of the following is correct? He had a head full of course hair

He had a head full of coarse hair

Which of the following is correct? He owns a golf coarse

He owns a golf course

Which of the following is correct? Of coarse I care about you

Of course I care about you

Which of the following is correct? The wool's too coarse for clothing

The wool's too course for clothing

Which of the following is correct? Follow the course of the river

Follow the coarse of the river

Which of the following is correct? He tried to keep the boat on course

He tried to keep the boat on coarse