按要求改写句子。   

1．严监生的病很重。     

扩句（至少2处）：                                                                                         

2．赵氏挑掉灯芯。     

改为“把”字句：                                                                                              

3．嘎子很可爱。     

改成比喻句：                                                                                                   

按照CBDSAM的结构，对系统进行更新，一般分为哪四个步骤？