小题1:Can /Could you tell me when the underground between Suzhou and Wujiang will be completed?
小题2:He forgot to remind me of the meeting time yesterday.
小题3:She is so young that she can not make the bed herself/on her own/by herself.或者She is too young to make the bed herself.
小题4:Although/Though he is rich, he lives a simple life.
小题5:It is our duty to keep our classroom clean and tidy.或者Keeping our classroom clean and tidy is our duty.