单项选择题
This kind of material expands（）the temperature increasing.
A.to B.for C.with D.at
单项选择题 People at the party worried about him, because no one was aware（）he had gone.
单项选择题 A sudden noise of a fire-engine made him（）to the door.
单项选择题 （）his examination of the patient, the doctor wrote out a prescription.
