根据句意、首字母或汉语提示填空。

1. Carrie will give a s______ in front of all her classmates.

2. She always feels n______ when she speaks in public.

3. —Don't make so much n______. Your father is sleeping.

4. It's ______ (正常的) for us to have these bad feelings, because everyone can't be happy all the time.

5. Ann is a ______ (陌生人) in the big city, so she has no friends. She feels very lonely.