我会按要求改写句子。     
1．难道我们不该珍惜时间，努力学习吗？（改为陈述句）
                                                                                                                                 
2．机灵的小松鼠在树上高兴地跳着叫着。（缩句）
                                                                                                                                 
3．小姑娘把水罐交给了母亲。（改“被”字句）  
                                                                                                                                 
4．下课后，我被老师叫到了办公室。（改“把”字句）
                                                                                                                                 
5．白云飘来飘去。（扩句）