He ______ have sent the e-mail at an earlier time, but there was something wrong with the network.
Have you found his name ______ in the papers?
The schoolboy regretted _______ after he didn't pass his exam.
The angry boss ________ from the chair and went directly to him.
——Why doesn't he buy you a drink?——I don't know why, but it isn't _______ he had no money.
We were told that it was our _______ to read the text together.