使用合适的情态动词或其否定式填空
can l take the book out of the reading room,madam?—l'm sorry,you（）.excuse me,（）you tell me where l can get some stamps?l think we should take raincoats with us,lt （）rain.whose Chinese book is it?----lt （）be John's.he is learning Chinese,but l'm not sure.must they do the work now?----no,they（）,they can do it tomorrow.