单项选择题
A．She has to post a letter instead. B．She has to turn down the man’s request. C．She’s not sure if the computer is fixed. D．She can’t send the message right now.
A．He needs another job as research assistant. B．He asked Professor Williams for assistance. C．He assists Professor Williams with his teaching. D．He is doing research with Professor Williams.
A．The cruel master. B．The man in the kitchen. C．The pet bird. D．The fourth chicken.