Fill in the blank with a proper preposition or adverb in the box. (用方框里恰当的介词或副词填空。) up in to around at away 1. My teacher took_________ my mobile phone because I used it in class. 2. In order _________catch the train, we got up early this morning. 3. I stay_________ home to do homework today. 4. If I have enough money, I will travel _________the world. 5. _________fact, I know all the things about the singer.