单项选择题
A．They must hurry up. B．They will miss the train. C．They won’t take this train. D．They won’t miss the train.
A．No problem. B．What is it C．Sorry, I don’t know. D．Yes, I could.
A．Yes, I’ll go with you. B．No, I don’t like it. C．It’s my pleasure. D．What about going to the beach