单项选择题
The public transports system in many cities in the world（）by the local authority.
A.is still ran B.are still run C.are still ran D.is still run
单项选择题 I saw she was in difficulty with all those parcels，so I offered my（）
单项选择题 I can do that job（）myself.
单项选择题 It is（）that he has to ask for help.
