After the operation, Bill has been doing a lot of physical exercise to build up his _____.
I would have dropped in on him, but I ____ his address.
. It’s high time that we ___ home and _____ supper now.
But for electricity, human life _____ so easy today.
We ___ to start our own business, but we never had enough money.
—We could have walked to the doctor’s; it was so near. —Yes. A ride ___ at all necessary.