单项选择题
M：What are you doing here, Joe W：I’ve lost my key and I’m waiting for my roommate to open the door．
A. Her roommate is lost. B. She can’t go into the room. C. Her key is lent to her roommate. D. The door of her room is opened.
A. By giving them part-time jobs. B. By opening an account for them. C. By providing them with a sum of money. D. By recommending a member of college to them.