There are ________ people in the supermarket. It’s so crowded.

Li Yundi began to learn the piano _____ the age of four and took part _____ the 14th Chopin International Piano Competition in 2000.[ ]

Today I feel very_______ .I can play the piano_______.

______ I see your ID card, sir? We have to check your information.

中华人民共和国的英文缩写是______.