

図書館では静かにしてください。
赤ちゃんが寝ているから、静かにして。
もう少し静かに話してくれませんか。
"しずかに(静かに)" is in the lesson "Head" (Level 44), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.