__the temperature, ________ waterturns into steam

I happened to notice Bob’s father quarrelling with the teacher in defense ofhis son — No wonder Bob always performs poorly in class It’s really “________”

Tom’s mother is too busy _______ housework _______ him with his homework.

Up to now, the program ______ thousands of children who would otherwise have died.

Suddenly I heard a man shouting at a driver, ________ car was blocking the street.