从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1. ------Let me help you cross the street. ------_________?I’m not that old.
A. Take your time B. No way
C. Come on D. Go ahead
2.---- Why do you look so worried?
---- My computer broke down and my essay _____ since.
A. has been left unfinished B. has left to finish
C. was left to finish D. had been left unfinished
3.Peter was so excited_______he received an invitation from his friend to visit Chongqig______he felt on top of the world.
A．when, who B．that, that C．when, that D．that, where
