如图，在△ABC中，AB=AC，DE是过点A的直线，BD⊥DE于D，CE⊥DE于点E；

（1）若B、C在DE的同侧（如图所示）且AD=CE．求证：AB⊥AC；

（2）若B、C在DE的两侧（如图所示），其他条件不变，AB与AC仍垂直吗？若是请给出证明；若不是，请说明理由．

根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

    Somebody says, “Time is money.” But I think time is 1 important than money. Why do I think so? Because when money is over, we can get it back. But when time is 2, it'll never be 3. That's 4 we shouldn't waste time.

    It goes with saying that the 5 is usually limited（有限的）. Even a second（秒） is very important. We should make full use of our time to do 6 useful.

    But a lot of people do not know the importance of time. It is a pity. They spend their limited time smoking, drinking, sleeping and 7. They do not know that wasting time means wasting part of their own 8.

    In a word, we should save time. We shouldn't 9 today's work for tomorrow. Please remember that we have 10 time to waste.

青年时期的钱伟长在美国大使馆填写签证表的宗教信仰一栏时说：“我没有宗教信仰。”美国官员说：“没有是不行的，你就填信仰孔教吧。”这件事情说明(　　)