根据句意，选用所给词的适当形式填空
country twelve they west happy
小题1:What do you want to buy for his ____________ birthday？A toy car.
小题2:We own the blue house while the yellow one is _______.
小题3:To eat in a ___________ restaurant is quite different from in a Chinese one.
小题4:China is one of the biggest _____________in the world.
小题5:How _________ the children are singing and dancing in the classroom.
