按要求改写句子。  

1．我的脸由于困窘和羞愧一下子涨得通红。    

     缩句：                                                                                                                 

2．夜幕笼罩了房屋、树木、大街小巷。     

     改为“被”字句：                                                                                                

     改为“把”字句：                                                                                               

     改为比喻句：                                                                                                       

3．樱桃树和李子树都不大结果子。我觉得它们并不存在。    

     用关联词语把句子合并成一句话：