句段填空。    

1．以花自喻，表达自己处境虽艰难，但忠贞报国之心始终不变的诗句：                                                

2．选自鲁迅先生的名言警句，说明广泛阅读、博览群书的好处：                                           

3．有关友谊的诗句：                                             

4．“好雨知时节，当春乃发生。”的后一句是：                                           

苦楝树叶