句型转换。

1. Let's have dinner. (改为否定句)

    Let's_____ ______dinner.

2. What can I do for you?(同义句)

    Can I ______ ______?

3. Those are rulers. (改为单数形式)

    ______ is a ______.

4. His brother has a computer. (改为一般疑问句)

     ________his brother a computer?

5. Your ID card is on the dresser. (对划线部分提问)

    ______ is ______ ID card?

下列内部控制措施中，能够对货款的安全性起不到作用的是______。

A．批准赊销与开票相独立
B．收取货款与销售收入记录相独立
C．批准销售折让业务与记账业务相独立
D．批准坏账与收款业务相独立