Not until he retired from teaching three years ago ________ having a holiday abroad.

you come to a party on Saturday, Peter— Oh, ______I’m already going out, I’m afraid.

He thought that painting copied by a modern artist was ______ great value and bought it ____ over a thousand dollars

I feel that one of main duties a teacher is to help the students to become better learners[ ]

Sir, you should ________ at the red light, but you didn’t.