Never did we have to play "stand up", "sit down", "speak out". I don't ____ one student who didn’t try his best.
______ entering the room, she opened her bag to review lessons.
This is the reason ______he explained at the meeting for his carelessness in his work.
______ is a waste of time spending many hours ______ computer games every day.
He is a man of great experience ______ we can learn a lot.
— After I expressed how sincerely I wished to get his help, he agreed to help me at last. — I can understand. ___________ .