2 . Just remember that it is ____________ (complete) normal to struggle with the stress that parent-child _______ (tension) create, and _______ you and your parents can work together to improve your relationship. (所给词的适当形式填空)

3 . Smiling and laughing has actually been shown to relieve ________ (tense) and stress. (所给词的适当形式填空)