按要求改写句子。   

(1)您说，这比山还高比海还深的情谊，我们怎么能忘怀？ 

    改写成陈述句：                                                                                                                                 

(2)老班长的病也不轻，成天就吃点我们吃剩的鱼骨头和草根，再不好好休息会支持不住的。  

    改写成反问句：                                                                                                                                  

(3)小林，把掉在地上的书捡起来。  

    改写成祈使句：                                                                                                                                  

(4)山洪从山谷里涌了出来，势不可当。 

    改写成比喻句，表现洪水来势凶猛：