--I’d like to invite you to dinner this Saturday.

--_______.

A．Oh, no, let’s not

B．I’d rather stay at home

C．I’m very sorry, but I have other plan

D．Oh, no. That’ll be too much trouble.

Susan finally became a popular singer after she practiced ______ for years. [ ]

A. sing     

B. to sing     

C. singing     

D. sang