安靜的英文單詞怎么寫？

　　例句：

　　她使嬰兒安靜入睡。

　　She hushed the baby to sleep.

　　她那么安靜，幾乎沒有人注意到她在這里。

　　She was so quiet that her presence was hardly noticed.

　　他們學會了安靜,而不讓安靜變得空虛。

　　Wait quietly and stay away from the roadway.