A．No, it’s open only to teachers and postgraduates.
B．Yes, he can study there if he is writing a research paper.
C．Yes, because he is a senior student.
D．Yes, but he needs the approval of his professor.

A．It is difficult for Alison to get her children to go to sleep again at night.
B．The neighbors’ son always comes home very late.
C．Alison found it hard to complain to her new neighbors about their son.
D．Alison is annoyed by her neighbors’ son blasting stereo all night.