—I'm going to travel to Sydney. Would you please tell me about your experiences there—（） Let's discuss it over lunch.

单项选择题—Why do you think I am not popular among my classmates—Maybe you don't talk about topics that interest them, （） everything you say is friendly.

A．as if
B．as long as
C．on condition
D．even though

单项选择题—I regret （） you John has been fired.—I can hardly believe my ears. He's such a fine worker.

A．telling
B．having told
C．to tell
D．to have told