——Are you satisfied with his answer? ——Not at all. It couldn’t have been________.
It’s not until no enemies were left that they________ .
While playing ping-pong, our eyes see the ball coming, judge its speed and then hit it back ________ it should go.
I was about to leave my house________the phone rang.
.________they were singing, the teacher came in.
All that can be eaten _______ eaten up.