单项选择题
One of the benefits of the new model is that it is easier（）than the old one.
A.operating B.to be operated C.to operate D.operated
单项选择题 What（）of blood does Tom have?
单项选择题 Let's not wait any longer, he might not（）at all.
单项选择题 One day while Mr. King was working, he had a(an)（）and his left leg was badly injured.
