13. He was absorbed ____ a book and didn’t hear your repeated call.
I wasn’t sure if he was really interested or if he ___ polite.
As he reached ___ front door, Jack saw ___ strange sight.
What would have happened, ___, as far as the river bank?
Our chairman hasn’t come yet. If he ___ on time, we would have to put off the meeting
You did’t let me help. If we ___ together, you ___ so tired.