Mr Brown taught ________ math when we were in Junior One.

Do you know Xiao Li well?—Yes. I _______ her since she was a little girl.

John sings very well. We listened to sing a beautiful song yesterday.

Have you seen______ pen? I left one here this morning.— Is it___________ black one? I think I saw it somewhere.

It’s very difficult ______ you to get the tickets ______ the World Cup. [ ]