1.A:would you like to have lunch with us? B:no,thanks.i've (just had lunch）________
2.can i play computer games now,mom?i (had finished) my homework.________
3.A:what do you think of new shoes?
B:they look nice.where (have you bought） them?_______
4.A:let's go and see the film by jet li,fearless.
B:i had seen that film.why do not we go and see hero?____________