用适当形式填空1.Nancy is going to__(play)the piano at the concert.2.The___(twins)parents are doctors.3.My dog ___(be)in the par

用适当形式填空1.Nancy is going to__(play)the piano at the concert.2.The___(twins)parents are doctors.3.My dog ___(be)in the park last night.4.Listen!Nancy ___(sing)an English song now.5.Which season do you like ___(good) ,summer or winter?