Lynn is riding a beautiful bike. I don't know when she ________ it.
A.buys B.is buying C.bought D.will buy
After listening to those wonderful songs, people cheered him warmly ________ once.
Mike's mother sent a letter to Mike. He signed for it ________ person this morning.
I'm so sorry to take your book ________. Here you are.
A.by bike B.by mistake C.by chance D.by accident
We don't know why Tom is so worried. It's not his problem________．
A.in person B.after all C.thanks to D.at least
Jerry is _________ today. He needs to clean the blackboard and the classroom.
A.on duty B.on fire C.on business D.on sale
