"become silent" - Translation from English to Arabic

He also said that our lives begin to end the day we become silent about things that matter.
وقال أيضاً إن حياتنا تبدأ في الانتهاء يوم نصمت إزاء أمور مهمة.

Explore at your choosing. By entering this building, you have all become silent bystanders.
بدخولكم هذا المبنى, جميعكم أصبحتم متفرجين صامتين

So I become silent, almost moody, and you know what she says?
هل تعلم ما قال لي ؟

-Yes, the guns have almost all become silent.
-نعم، لقد توقفت البنادق تقريبا