单项选择题A．He’s also interested in American literature.B．He hasn’t decided if he would take the literature class.C．The woman should have already finished her paper.D．The woman’s topic may not be appropriate.

单项选择题A．They are more likely to damage the cave.B．It’s hard for them ’to stay awake.C．They tend to break their equipment.D．They may imagine seeing things that aren’t really there.