—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.

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

单项选择题—What was it that caused the party to be put off—（）the invitations.

A．Tom delayed sending
B．Tom delayed to send
C．That Tom delayed sending
D．Tom delaying sending