—What did the teacher say just now? — Sorry. I didn’t catch it. I ____ something else.
Mr. Zhou was really anxious _____he can’t find his car.
— What would you do if you won the lottery? — I would give it_____ medical research.
That notebook _____ John’s. It has his name on it.
Iplay the piano when I was a young boy.
Teenagers should not _____ .