【2014山东菏泽】---When will you return the book to me?---I’ll give it to you _____ I finish it.
Mr. Black is our English teacher. He ______ in our school since 2011.
— We don’t have enough meat in the fridge. — I _______ some more in the supermarket soon.
— May I put my car here? — No, you _______. Put it over there, please.
Is there _______ useful on science? I’m looking for information about this topic.
Which is __________, traveling by air or by train?