1.Thereisabookinthebookcase.(改成一般疑问句)
_________abookinthebookcase?
2.Therearesomekeysonthebed.(对画线部分提问)画线部分:somekeys
___________onthebed?
3.Abaseballisunderthechair.(改成同义句)
___________abaseballunderthechair.
4.Therearetwopencilsinmybag.(改成同义句)
_________twopencilsinmybag.