No matter how bright a talker you are, there are times when it's better __________ silent.
I am very ___ to you for your kindness.
—She is angry with me, isn’t she? ---______.
---May I have a copy of Lu Xun’s short stories? ---Certainly. ___.
To ___ with, he is too lazy.
He ___ me he was going abroad for further study, but he didn't ___ when he was leaving.