按要求写句子。

1. May I go on a trip to Canada?（作否定回答） 

    ____________, you ____________ ____________. 

2. May I buy some books about Harry Potter?（作肯定回答） 

    ____________, ____________ ____________.

3. My grandfather is old. He can't go to Beijing by himself. (用too…to合并句子)

    My grandfather is ____________ ____________ ____________ go to Beijing by himself.

函数f（x）=log₂|x|+1，

（1）用定义证明f（x）是偶函数；

（2）解不等式：f（x）≥3。