3道英语问题,
根据要求改写下列各句．
1.He is the tallest boy in our class.（写出同意句）
He is taller than any ______ _______ in our class.
2.Sorry,I don't know.（写同意句）
Sorry,I have ________ _______.
5.It's about half an hour's walk from here to the gailway atation.（对”about half an hour's”进行提问．）
___________ ________ is itfrom here to the railway station?