在一个会计期间发生的一切经济业务，都要依次经过的核算程序是______。

A．填制审核凭证、复式记账凭证、编制会计报表
B．填制审核凭证、登记账簿、编制会计报表
C．设置会计科目、成本计算、复式记账
D．复式记账、财产清查、编制会计报表

用 when或 while填空。

1. I was looking out of the window _________ the teacher asked me.

2. What is he doing _________ his parents came back？

3. Mike was playing games _________ Jack was studying.

4. I was about to fall asleep _________ the baby began to cry.