她指着她的手表示意时间已晚，她想离开。

She pointed to her watch as a ___sign that it was getting late and she wanted to leave.

他竖起了大拇指，所以我知道一切都没问题。

He made the thumbs up ___sign, so I knew everything was OK.

当你准备好回家时，给我一个信号。

Give me a ___sign when you're ready to head home.