there is only one family under

there is only one family under there is only one family here（对only one提问） There is only one shoe under the bed,I can't find____ There are only one piano in you family 改错 There is always only one truth! There is always only one truth There is only one thing___I can do. There is only one year between ___. There is just only one turth There is only one earth with not only human beings. there is only one student in the classroom .对one there is going to be only one country there will be only one