单项选择题
A police officer claimed that the young man had attempted to（）paying his fare.
A.avoid B.reject C.refuse D.neglect
单项选择题 While I was in the university, I learned taking a photo,（）is very useful now for me.
单项选择题 This kind of material expands（）the temperature increasing.
单项选择题 People at the party worried about him, because no one was aware（）he had gone.
