根据答语写出问句。 1. —__________________________? —My books are on the desk. 2. —__________________________? —His baseball is under the chair. 3. —__________________________? —Yes,  it is.  My hat is on the bed. 4. —__________________________? —No, they aren't. Her pencils are not in the bookcase. They are in her desk. 5. —__________________________? —Their plants are on the table.