The effect a teacher has _______ children may be greater than that of their parents.
It’s illegal for a public official to ask people for gifts or money ________ favors to them.
The coat ________ thin but ________.
Food supplies in the earthquake area ________. We must act immediately before there’s none left.
No scientists can exactly figure out what ________ happened ________ at that time, which caused the extinction of the dinosaurs.
Experiments of this kind ________ in both the U.S. and Europe long before the Second World War.