---You know Mr. Green has been ill for days? ---Yes, I wonder if he is _________ better now.
Have you seen Tom recently? I wonder ______ with his students.
It was because of bad weather ____ the football match had to be put off.
All examinations are passed. This is the first time I ____ really relaxed.
She insisted that we ________ the source of the river and begin our journey there.
_____ he is determined to do something, no one is able to make him ______.