The little boy still needed the ______ 20 dollars to do with the things ______ .
—When did he leave the classroom? —He leftyou turned back to write on the blackboard.
he thought he was helping us with the work, he was actually in the way.
Hearing his words ,I couldn’t decide or remain .
Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
—Will you go to Mary’s birthday party? —No, ____ invited, I can’t go to it. I’ll be too busy then.