Lucy is ___ shy girl， but she's good at playing piano．（　　）

Whose iPad is this？

I think it's ___． She was looking for it everywhere．（　　）

Have you heard of Lin Zexu and Zhan Tianyou？

Of course． They are our national （　　）

The population of China is much than that of England．（　　）

Listen! I think it____ be Mr． White singing in the office．

No， it ___ be him． He left for London just now．（　　）