存在句练习一用 be动词填空。1. There_ a rubber in your pencil-box.2. There _ two books on the dask.3. There_an apple and some oranges on the tree.4. _ there a pen in your book?5. There _ some desks in the classroom.6. There _ many pictures on the wall.二根据例子造句。例： a book / desk _There is a book on the desk.1.a TV / sitting room 2.a computer /stud
