_________ impressed the visitors was _______ the trees were so tall in Vancouver.
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.