Give the correct form of the word given in the present perfect:
Nhung: ________ you ever _______ (eat) a Philadephia cheesesteak?
Nora: Yes, I have.
Nhung: Really? __________ you ______ (be) to Philadelphia?
Nora: Yes, I ________ (be)
there twice. I ___________ (visit)
many famous places in the city.
Nhung: ________ you _________ (visit) the Constitution Center?
Nora: No, I haven't, but I __________ (see)
the Liberty Bell. Look at this postcard.