— Did you know any Chinese, Joyce, before you arrived in Beijing? — In fact, never _______ it.
We must not touch this switch under any ______.
I had written twice to Janet. But she didn't ______ my letters, so I decided to go there myself.
You've ______ a zero in this phone number, so you can't get through.
He did not regret saying what he did but felt that he ______ it differently.
--You didn't wait for Tom yesterday. --Yes, but we ______. He didn't come.