按要求写句子

1. —Where are my hats?(完成答句) 

    —Sorry, I____   ___

2. on. table, the, is, the, plant(?)(连词成句)

3. His backpack is under the table.(对画线部分提问)   

    ____his backpack?

4. His phone number is 626-3333.(对画线部分提问)  

    ____his phone number?

5. Are those oranges?(改为单数句)

    _____ _____ _____ _____？

当Intel8253可编程定时/计数器工作在方式0,在初始化编程时,一旦写入控制字后( )。

A．输出信号端OUT变为高电平

B．输出信号端OUT变为低电平

C．输出信号保持原来的电位值

D．立即开始计数