I think they are---(happy,happily)

They are playing together ----------(happy/happily) They are singing----------.How ------they look.happy.happily do you think they are happy?（）i think （）.一空一词 肯定回答 They all looked_______(happy/happily) How ------they are是happy还是happily为什么 什么时候用形容词,什么时候用副词.谢谢 They live _____.a.happy b.happily You are not happy,you think I will be happy? how ____they are a.happy b.happily They()happily when I ()them I felt happy还是I felt happily where are they I think they are at a ()()一空一词 how happy they look 还是how happily they look