It is generally believed that teaching is ___________it is a science.
Food supplies may ________ towards the end of the trip, so we can’t waste any food.
Be ____ to finish your homework before supper.
His proposal is very _____. We do not need any explanation.
— I stayed at a hotel while in New York . — Oh , did you ? You ____ with Barbara .—
He ____ you more help even though he was very busy .