Customers have to fill out forms which (mail) _____ to them.

A．He asked the woman to give a talk on chemistry.
B．He persuaded the woman not to take the course.
C．He gave a talk to the chemistry class.
D．He told the woman it was right to choose chemistry.

A．Yes, please.
B．Yes, I prefer tea.
C．I like coffee very much.
D．Thank you very much.