已知函数f（x）=lnx-ax²+x，（a＞0）

（I）求a的最大值，使函数f（x）在（0，+∞）内是单调函数；

（II）若对于任意的x∈（0，+∞），总有f（x）≤0，求a的取值范围．

按要求改写下面句子。

1. He spoke English so quickly that we couldn't understand. (改为同义句)

    He spoke English _____ quickly for us _____ understand.

2. They never met such a man, _____ _____? (改为反意疑问句)

3. We have been there twice. (就划线部分提问)

    How                       have you been there?

4.They are going to repair the road soon. (改为被动语态)

   The road is going to                         soon.

5. My mother didn't decide where we would go for a holiday. (改为简单句)

    My mother didn't decide _____ _____ go for a holiday.