蚯蚓、蝗虫、家鸽、鲸四种动物与外界进行气体交换的场所分别是（　　）

根据句意及首字母提示填空。
(1)You can ask a____ around you for help when you are in trouble.
(2)The girl will give us a c____ in English this afternoon.
(3)His s____  cheered the girl up. She was very thankful (感谢的).
(4)She always feels n____  when she speaks in public.
(5) —Don't make so much n____ . Your father is sleeping. —Sorry, Mom. I won't do that again.

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．