用所给单词的适当形式填空。

1. My mother is used to              (go) shopping on Sundays.

2. They go out of their way to make me ____      (feel) at home.

3.I find it difficult              (understand) everything.

4. His bike is              (difference) from mine.

5. There is no reason___         (come) to school late today.

全分散控制程控交换机各类控制器的再启动间隔指标应大于（）。再装入间隔指标应大于（）。

A.600h，1700h

B.600h，600h

C.1700h，1700h

D.1700h，600h