(Blank)
They are going to find out the cause of the accident.
Future, be going to
She twisted to stare at him.
Past Simple
I was going on foot while he was driving.
Past Continuous
In small doses it tends to relieve pain.
Present Simple
They will probably purchase a few things for Christmas tomorrow.
Future Simple
She waited, but he didn't emerge again.
Past Simple
I'm wondering what's wrong with me.
Present Continuous
My wife has already recovered after the treatment.
Present Perfect
I used to pretend to be sick when I was in school.
Past Simple, used to