句型转换。

1. These are English books. (改为单数句)

     ______ ______ ______English book.

2. The ring is in the drawer. (对画线部分提问)

     ______ ______the ring?

3. —Are these keys in the drawer?(作肯定和否定回答)

    —Yes,______ ______.

    —No,______.

4. There is a computer game on the desk.(改为复数句)

    ______ ______ ______ ______ ______on the desk.

5. Many apples are in the basket．(改为同义句)

    ______ ______many apples in the basket.

设一棵二叉树中有3个叶子结点，有8个度为1的结点，则该二叉树牛总的结点数为 【1】 。