_____ an important decision more on emotion than on reason, you will regret it sooner or later.
—Jim is very sick these days. He coughs so badly. —In my opinion, he really ________ listen to the doctor and cut down on smoking.
—Where did you get this book? —I picked it up from a secondhand bookshop if you ________ know.
When Harry was at college, he ________ go to the reading room after supper every day.
Don't be angry with us. We ________ with you together, but we were busy with our final reports when you called in.
Your teacher ________ very angry at that moment because you talked back to her like that.